247170

Appears in sequences

• Number of partitions of n into parts of 5 kinds.at n=13A023004
• Numbers k such that 2k+1, 4k+1, 6k+1, 8k+1 and 10k+1 are primes.at n=16A124410
• Numbers n that raised to the powers from 1 to k (with k>=1) are multiple of the sum of their digits (n raised to k+1 must not be a multiple). Case k=13.at n=24A135198
• Numbers k such that Euler phi(Dedekind psi(k)) > k.at n=20A196200
• Number of n X 5 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=14A209647
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) is Sum_{j=0..2*n} (-1)^(n+j) * binomial(2*n,j)^k.at n=47A350594
• Number of partitions of [n] with distinct block sizes such that no block contains its size as an element.at n=13A364278
• Products of 6 distinct primes that are sandwiched between semiprime numbers.at n=30A378627