68441

Appears in sequences

• Sixth degree product sequence: a(n) = product( 1 +4*cos(k*Pi/n)^2 +16*cos(k*Pi/n)^4 +64*cos(k*Pi/n)^6, k=1..(n-1)/2 ).at n=11A152116
• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=15A189639
• a(n) = 6*n^3 - 263*n^2 + 3469*n - 12841.at n=38A218457
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=16A348426
• Number of partitions of n with at most five part sizes.at n=46A364809