89851

Appears in sequences

• Numbers n such that sigma (phi ( n ) ) = sigma (sigma (n ) ) where phi is Euler's totient and sigma is the multiplicative sum-of-divisors function.at n=33A065556
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={0,2}.at n=35A079966
• Number of tilings of a 14 X n rectangle using 2n heptominoes of shape I.at n=25A250664
• Number of odd enriched p-trees of weight n (all outdegrees are odd).at n=17A300439