Sequences

Numbers ending with '6' that are the difference of two positive cubes.

Numbers ending with '7' that are the difference of two positive cubes.

Numbers ending with '8' that are the difference of two positive cubes.

Numbers ending with '9' that are the difference of two positive cubes.

a(n) = (n+3)^3 - n^3.

(n+4)^3 - n^3.

a(n) = (n+5)^3 - n^3.

If a Fibonacci sequence is formed with first term = number of digits in n and second term = sum of decimal digits in n, then n itself occurs as a term in the sequence after the first two terms.

Primes p such that both p-2 and 2p-1 are prime.

Irregular triangle read by rows: T(n,k) = number of orbits of order exactly k under doubling map which remain in a semicircle, with k dividing n.

Triangle read by rows: T(n,k) = number of orbits of order k under doubling map which remain in a semicircle, with k dividing n.

Primes congruent to {0, 1, 4} mod 5.

Primes p such that 2 is a square mod p; or, primes congruent to {1, 2, 7} mod 8.

Primes p such that 3 is a square mod p.

Primes p with legendre(3,p) = -1.

Primes p such that 6 is a square mod p.

Primes p such that 6 is not a square mod p.

Primes p such that 7 is a square mod p.

10 is a square mod p.

Primes p such that 10 is not a square mod p.

Odd primes p such that 11 is a square mod p.

Primes that are not in A038881.

Odd primes p such that 13 is a square mod p.

Primes p such that 13 is not a square mod p.

14 is a square mod p.

Primes p such that 14 is not a square mod p.

15 is a square mod p.

Primes p such that 15 is not a square mod p.

Primes p such that 17 is a square mod p.

Primes p such that 17 is not a square mod p.

Odd primes p such that 19 is a square mod p.

Primes p such that 19 is not a square mod p.

Odd primes p such that 21 is a square mod p.

Primes p such that 21 is not a square mod p.

22 is a square mod p.

Primes p such that 22 is not a square mod p.

23 is a square mod p.

Primes p such that 23 is not a square mod p.

26 is a square mod p.

Primes p such that 26 is not a square mod p.

Primes p such that 29 is a square mod p.

Primes p such that 29 is not a square mod p.

30 is a square mod p.

Primes p such that 30 is not a square mod p.

31 is a square mod p.

Primes p such that 31 is not a square mod p.

Primes p such that 33 is a square mod p.

Primes p such that 33 is not a square mod p.

Primes p such that 34 is a square mod p.

Primes p such that 34 is not a square mod p.