31859

Properties

Appears in sequences

• Number of positive integers <= 2^n of form x^2 + 12 y^2.at n=18A000021
• Prime number spiral (clockwise, Southwest spoke).at n=29A054568
• List of primes produced by a certain "prime-generating" quartic polynomial.at n=14A096372
• Primes of the form prime(n)^2 - prime(n+1) - 1.at n=18A097938
• Primes p such that googol - p is prime.at n=21A108252
• Primes of the form n^2+5*n+c (n>=0), where c=3 for even n and c=-3 for odd n.at n=33A117012
• Sophie Germain primes for which the reversal is also a Sophie Germain prime.at n=31A118573
• Least Ramanujan prime having a gap of 2n to the next Ramanujan prime.at n=48A182874
• Primes p such that p^4 + p +/- 1 are twin primes.at n=16A236951
• Primes of the form k+(k+3)^2 where k is a nonnegative integer.at n=34A248697
• Number of chiral pairs of polyomino rings of length 2n with twofold rotational symmetry.at n=18A348403
• Prime numbersat n=3423