25383

Appears in sequences

• Number of SiC polytypes that repeat after 2n layers.at n=31A011959
• a(n) = (n^3)/2 + (3*n^2)/2 + 3*n + 3.at n=35A127873
• Inverse Mobius transform of the superabundant numbers, A051731 * A004394.at n=21A134672
• G.f.: A(x) = exp( Sum_{n>=1} sigma_n(2n)*x^n/n ), where sigma_n(2n) is the sum of the n-th powers of the divisors of 2*n.at n=5A156360
• Number of compositions of n having exactly seven fixed points.at n=14A240742
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 filled by rows with each element moved a city block distance of 0 1 or 2, and rows and columns in increasing lexicographic order.at n=21A263506
• Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 0 1 or 2, and rows and columns in increasing lexicographic order.at n=6A263507
• Indices of primes in A000219.at n=42A285216
• a(n) is the smallest k such that uphi(k*n) = uphi(k*n+1), or 0 if no such k exists.at n=52A291530