27761

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (F(2), F(3), ...), t = (odd natural numbers).at n=24A024592
• Numbers k such that 67*2^k-1 is prime.at n=12A050559
• Polar structured meta-anti-diamond numbers, the n-th number from a polar structured n-gonal anti-diamond number sequence.at n=16A100188
• Principal diagonal of the convolution array A213774.at n=12A213775
• Sum of smallest parts of all partitions of n into an even number of parts.at n=41A222045
• a(n) gives the odd leg of one of the two Pythagorean triangles with hypotenuse A080109(n) = A002144(n)^2. This is the smaller of the two possible odd legs.at n=27A253802
• Numbers k such that (182*10^k + 1)/3 is prime.at n=22A282358
• Number of n-step 8-dimensional nonnegative lattice walks starting at the origin and using steps that increment all components or decrement one component by 1.at n=6A346229