23199

Appears in sequences

• a(n) = (2*n-1)*(n^2 -n +2)/2.at n=28A063488
• Numbers k such that sigma(sigma(k)) == phi(k) (mod sigma(k)).at n=15A067204
• a(n) = n*(14*n^2 - 21*n + 13)/6.at n=22A071229
• a(n) = 58*n^2 - 1.at n=19A158668
• The number of permutations avoiding simultaneously consecutive patterns 132 and 213.at n=9A173939
• Number of distinct resistances that can be produced using n equal resistors in, series, parallel and/or bridge configurations.at n=11A174283
• G.f. A(x) satisfies: A(x) = 1 + Sum_{n>=1} x^n*A(x)^A006519(n) where A006519(n) = highest power of 2 dividing n.at n=11A191769
• Numbers n such that sigma(n) divides the sum of the numbers x not coprime to n, with x<=n.at n=8A239208
• Numbers n dividing every cyclic permutation of n^4.at n=28A242740
• Numbers n with the property that k*n and (k+1)*n have a common nonzero digit for all k.at n=33A308466