28813

Properties

Appears in sequences

• A variant of the cuban primes: primes p = (x^3 - y^3)/(x - y) where x = y + 2.at n=18A002648
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 100 ones.at n=27A031868
• Primes for which the period of the reciprocal equals (p-1)/14.at n=21A135073
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (0, -1, 1), (1, 1, -1), (1, 1, 1)}.at n=8A149742
• G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^(3*n^2).at n=6A191801
• Smaller of the two consecutive primes whose sum is a triangular number.at n=35A225077
• Begin with a(0) = 3. Let a(n) for n > 0 be the smallest positive integer not yet in the sequence which forms part of a Primitive Pythagorean Triple (PPT) when paired with a(n-1).at n=44A239356
• Molien series for invariants of finite Coxeter group A_9.at n=64A266778
• Primes prime(k) such that (prime(k), prime(k+1)), (prime(k+2), prime(k+3)), (prime(k+4), prime(k+5)) form a triangle of area 2.at n=26A308649
• Primes p such that if q is the next prime, the sum (with multiplicity) of prime factors of p^2 + q^2 is a square.at n=13A359443
• Expansion of e.g.f. exp(x / (1 - x^2)) / (1 - x^2).at n=7A373683
• Prime numbersat n=3138