Sequences

Position of n^2 - n + 1 in A003136.

a(n) = number in position n when all i^2 - i*j + j^2, where 1 <= i < j are arranged in increasing order.

Duplicate of A024606.

Numbers of the form x^2 + xy + y^2, where x and y are positive integers.

Positions of even numbers in A024614.

Positions of odd numbers in A024614.

Position of n^2 + n + 1 in A024614.

Positions of primes in A024614.

Numbers that are not powers of primes p^k (k >= 0); complement of A000961.

Positions of primes among the powers of primes (A000961).

Positions of nonprimes among the powers of primes (A000961).

Position of 2^n among the powers of primes (A000961).

a(n) is the number of prime powers <= 3^n.

a(n) is the position of square of n-th prime among the powers of primes (A000961).

a(n) is the position of cube of the n-th prime among the powers of primes (A000961).

Positions of squares among the powers of primes (A000961).

Positions of cubes among the powers of primes (A000961).

Odd numbers k such that neither k nor k + 2 is a power of a prime.

n written in fractional base 3/2.

n written in fractional base 4/2.

n written in fractional base 4/3.

n written in fractional base 5/2.

n written in fractional base 5/3.

n written in fractional base 5/4.

n written in fractional base 6/2.

n written in fractional base 6/3.

n written in fractional base 6/4.

n written in fractional base 6/5.

n written in fractional base 7/2.

n written in fractional base 7/3.

n written in fractional base 7/4.

n written in fractional base 7/5.

n written in fractional base 7/6.

n written in fractional base 8/2.

n written in fractional base 8/3.

n written in fractional base 8/4.

n written in fractional base 8/5.

n written in fractional base 8/6.

n written in fractional base 8/7.

n written in fractional base 9/2.

n written in fractional base 9/3.

n written in fractional base 9/4.

n written in fractional base 9/5.

n written in fractional base 9/6.

n written in fractional base 9/7.

n written in fractional base 9/8.

n written in fractional base 10/2.

n written in fractional base 10/3.

n written in fractional base 10/4.

n written in fractional base 10/5.