A000040 OEIS vs. A000290 OEIS

What's the Difference?

A000040 OEIS is the sequence of prime numbers, while A000290 OEIS is the sequence of Fibonacci numbers. Both sequences are fundamental in number theory and have been extensively studied for their unique properties. The prime numbers are the building blocks of all integers, while the Fibonacci numbers exhibit a fascinating pattern of growth and recurrence. Despite their differences, both sequences play a crucial role in mathematics and have inspired countless research and discoveries.


AttributeA000040 OEISA000290 OEIS
NamePrimesMobius function
DefinitionSequence of prime numbersSequence of values of the Mobius function
FormulaNoneDefined by cases based on prime factorization
First few terms2, 3, 5, 7, 11, 13, 17, 19, 23, 291, -1, -1, 0, -1, 1, -1, 0, 0, 1

Further Detail


When it comes to the Online Encyclopedia of Integer Sequences (OEIS), two popular sequences that are often compared are A000040 and A000290. These sequences have distinct attributes that make them unique and interesting to study. In this article, we will delve into the characteristics of each sequence and explore how they differ from one another.

Attributes of A000040 OEIS

A000040, also known as the "Fibonacci numbers" sequence, is one of the most well-known integer sequences in mathematics. The sequence starts with 0, 1, 1, 2, 3, 5, 8, and continues infinitely by adding the two previous numbers to generate the next number. The Fibonacci numbers have a wide range of applications in various fields, including mathematics, computer science, and nature. They exhibit a fascinating pattern where each number is the sum of the two preceding numbers.

One interesting attribute of the Fibonacci numbers is their connection to the golden ratio, a mathematical constant that appears in various natural phenomena and art forms. The ratio of consecutive Fibonacci numbers converges to the golden ratio as the sequence progresses. This relationship adds to the mystique and allure of the Fibonacci numbers, making them a subject of fascination for mathematicians and enthusiasts alike.

In addition to their mathematical significance, the Fibonacci numbers have practical applications in fields such as computer algorithms, where they are used to optimize search and sorting processes. The sequence's recursive nature allows for efficient computation and problem-solving strategies that leverage the inherent properties of the Fibonacci numbers. This practical utility further enhances the appeal and relevance of A000040 in various domains.

Furthermore, the Fibonacci numbers have inspired a wealth of artistic and cultural interpretations, with references to the sequence appearing in literature, music, and visual arts. The aesthetic appeal of the Fibonacci numbers, coupled with their mathematical elegance, has made them a symbol of beauty and harmony in creative expressions. This intersection of mathematics and art underscores the multidimensional nature of the Fibonacci numbers and their enduring impact on human creativity.

Overall, A000040 stands out for its mathematical significance, practical applications, and cultural resonance, making it a versatile and captivating sequence that continues to captivate scholars and enthusiasts across disciplines.

Attributes of A000290 OEIS

A000290, also known as the "Mersenne numbers" sequence, is another prominent integer sequence that has garnered attention in the mathematical community. The sequence is defined by the formula 2^n - 1, where n is a non-negative integer. Mersenne numbers are named after the French mathematician Marin Mersenne, who extensively studied these numbers in the 17th century.

One key attribute of the Mersenne numbers is their connection to prime numbers, specifically Mersenne primes, which are prime numbers of the form 2^n - 1. These primes have unique properties that make them valuable in cryptography, number theory, and computer science. The search for Mersenne primes has been a longstanding pursuit among mathematicians, leading to the discovery of increasingly larger prime numbers over the years.

Another intriguing aspect of the Mersenne numbers is their role in the field of perfect numbers, which are numbers that are equal to the sum of their proper divisors. Mersenne numbers play a crucial role in the classification and study of perfect numbers, providing a link between number theory and algebraic structures. The interplay between Mersenne numbers and perfect numbers has led to significant advancements in mathematical research and exploration.

Furthermore, the Mersenne numbers exhibit a rich pattern of divisibility and factorization properties that have fascinated mathematicians for centuries. The unique structure of Mersenne numbers, characterized by their binary representation and exponential form, lends itself to intricate mathematical analyses and conjectures. The exploration of Mersenne numbers has opened up new avenues for research and discovery in the realm of number theory and computational mathematics.

In summary, A000290 stands out for its connections to prime numbers, perfect numbers, and divisibility properties, making it a compelling sequence that continues to intrigue mathematicians and researchers seeking to unravel the mysteries of number theory and algebraic structures.


In conclusion, the A000040 and A000290 sequences in the OEIS offer unique insights into the world of integer sequences and their diverse applications in mathematics and beyond. While A000040 showcases the elegance and beauty of the Fibonacci numbers with their golden ratio connections and practical utility, A000290 delves into the realm of Mersenne numbers with their prime number relationships and perfect number implications. Both sequences have distinct attributes that make them valuable subjects of study and exploration for mathematicians, scientists, and enthusiasts alike.

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