65021
domain: N
Appears in sequences
- Quasi-Carmichael numbers to base 5: squarefree composites n such that (n,2*3) = 1 and prime p|n ==> p-5|n-5.at n=12A029558
- a(n) = n * (2*n + 1) * (6*n^2 + 4*n + 1) / 3.at n=11A132123
- a(n) = (8*n+5)*(8*n+9).at n=31A146302
- a(n) = 100*n^2 + 100*n + 21.at n=25A152161
- Integers k whose binary expansion (D digits in length) is the same as the initial D digits of the binary expansion of the square root of k to the right of the binary point.at n=12A165309
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 3", based on the 5-celled von Neumann neighborhood.at n=7A269911
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 961", based on the 5-celled von Neumann neighborhood.at n=7A273832
- Expansion of (1/x) * Series_Reversion( x / ((1+x)^4+x^2) ).at n=6A369213