25569

Appears in sequences

• Numbers k such that (2*k)!/(2*(k!)^2)+1 is prime.at n=47A112863
• A126789 with zeros removed.at n=45A176623
• a(n) = -3*a(n-1) + a(n-3), with a(0)=0, a(1)=6, and a(2)=-15.at n=9A215917
• Numbers whose arithmetic derivatives are a permutation of their digits.at n=33A225902
• Expansion of Product_{k>=1} (1 + x^(k*(k+1)/2))^(k*(k+1)/2).at n=41A298850
• Total sum of major indices of heapable permutations of length n.at n=7A387955