20797

Appears in sequences

• Strong pseudoprimes to base 55.at n=11A020281
• a(n) = ceiling((n + 1/2)^3).at n=26A034131
• 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=9A148853
• Indices j in A000040 such that j is an odd composite and the distinct digits of the prime A000040(j) are in increasing order.at n=39A155775
• a(n) = floor(M(g(n-1)+1, ..., g(n))), where M = harmonic mean and g(n) = n^3.at n=27A227012
• Numbers n such that n*2^2281 - 1 is prime.at n=17A265504
• a(n) is the number of triangles (up to congruence) with integer coordinates that have perimeter strictly less than n.at n=42A298121
• a(n) = Sum_{k=1..n} floor(n/k)^3.at n=25A318742
• Expansion of e.g.f. 1 / sqrt(1 - 2 * x * (exp(x) - 1)).at n=7A375695