20855
domain: N
Appears in sequences
- Integer part of (Product(n^((1 + log(1 + i))/i^2), {i, 1, n})).at n=22A062486
- Nearest integer to (Product(n^((1 + log(1 + i))/i^2), {i, 1, n})).at n=22A062487
- Numbers k such that reverse(gpf(k)) = gpf(k+1), where gpf(n) = A006530(n); a(1)=1.at n=29A071844
- Numerator of Bernoulli(n, 2/7).at n=7A158507
- Partial sums of 3-almost primes which are again 3-almost primes, i.e., have exactly 3 not necessarily distinct prime factors.at n=28A217018
- Numbers k such that k*8^k + 1 is prime.at n=4A242178
- Numbers k such that (10^k + 77)/3 is prime.at n=21A281303
- Numbers which are palindromic in their Elias delta code representation.at n=41A281380
- Number of terms in the fully expanded n-th derivative of x^(x^x).at n=31A281434
- Number of irredundant sets in the n-gear graph.at n=6A290589
- a(n) = (n^2 + 1) * (2*n - 1).at n=21A290631
- Numbers k such that 3*10^k + 67 is prime.at n=18A295328
- The number of unit squares enclosed by the rectangular spiral of which the n-th side has length prime(n).at n=36A356465