22917
domain: N
Appears in sequences
- a(n) is the smallest index m such that Sum_{k=2..m} 1/PrimePi(k) >= n, where PrimePi()=A000720().at n=44A074633
- a(n) = (1/3)*n^3 - n^2 - (1/3)*n - 1.at n=42A109620
- Column 1 of triangle A132615 divided by twice the row index less 1.at n=5A132619
- Expansion of Product_{k>=1} (1 + x^k)^k / (1 + x^(4*k))^(4*k).at n=23A285292
- a(n) = 2*a(n-1) - a(n-3) + a(floor(n/2)) + a(floor(n/3)) + ... + a(floor(n/n)), where a(0) = 1, a(1) = 1, a(2) = 1.at n=17A298406
- Numbers n with the property that n^2 contains a sequence of four or more consecutive 8's.at n=11A301938