38805
domain: N
Appears in sequences
- Squarefree numbers of the form (prime(k)+1)*(prime(k+1)+1)/4.at n=16A079095
- Let f(n) = exp(Pi*sqrt(n)); sequence gives numbers n such that f(n) - floor(f(n)) < 1/10^3.at n=36A127028
- a(n) = (8*n+3)*(8*n+7).at n=24A146301
- Quintisection A061037(5*n+2).at n=39A165248
- a(n) = 16n^4 + 64n^3 + 104n^2 + 80n + 21.at n=6A176711
- -3-Knödel numbers.at n=36A225507
- The number of P-positions in the game of Nim with up to 5 piles, allowing for piles of zero, such that the number of objects in the largest pile is n.at n=22A241731
- a(n) = prime(n)^2 - 4*prime(n).at n=43A245034
- Solutions k of the equation cototient(k) = cototient(k-1) + cototient(k-2) where cototient(k) is A051953.at n=7A332972
- Expansion of g.f. A(x) satisfying A(x) = A( x^2*(1+x)^4 ) / (x*(1+x)^3).at n=12A369547
- Numbers k such that sopfr(k + sopfr(k)) = sopfr(k) + sopfr(sopfr(k)), where sopfr = A001414.at n=38A376851