131078
domain: N
Appears in sequences
- a(n) = 2^n + 6.at n=17A153972
- Sums of two (not necessarily distinct) Mersenne primes (A000668).at n=16A171251
- a(n) = 2^n - 2*n*A000048(n).at n=51A182256
- 1/4 the number of (n+1) X 6 0..2 arrays with every 2 X 2 subblock having distinct clockwise edge differences.at n=32A209724
- Numbers whose derivative is equal to the arithmetic derivative.at n=41A273993
- Number of same-trees of weight n.at n=33A281145
- Irregular triangle, read by rows, where row n lists composite numbers c such that c * sigma_n(c) == 2 (mod phi(c)) for n >= 0. Row lengths for n=0,1,... are given in A392307.at n=59A392306