61684

Appears in sequences

• a(n) is the smallest k such that number of non-unitary prime divisors of central binomial coefficient, A000984(k) = C(2*k,k) equals n.at n=40A081393
• 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, 0), (-1, -1, 1), (-1, 0, 0), (1, 0, -1), (1, 1, 0)}.at n=10A149093
• Integer lengths of the Mills primes A051254.at n=11A224845
• The first of 50 consecutive positive integers the sum of the squares of which is a square.at n=25A269451
• Expansion of Product_{k>=1} (1 - 2*x^k)/(1 + 2*x^k).at n=16A303397