27804
domain: N
Appears in sequences
- Female of (1/(n+1),n/(1+n)) pair function used to get a dual population Fibonacci.at n=24A100582
- Exponential Riordan array (e^(x(1+x)),x).at n=48A122832
- Numbers k such that both k and k^2 are sums of a twin prime pair.at n=10A213784
- Number of tilings of a 5 X n rectangle using n pentominoes of distinct shapes.at n=10A246902
- a(n) is the sum of quadratic nonresidues of A002145(n) (the n-th prime == 3 mod 4).at n=34A282036
- Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p .at n=17A282726
- Numbers k such that k^2+1, (k+2)^2+1 and (k+6)^2+1 are prime.at n=43A302021
- G.f. A(x) satisfies: 1 = Sum_{n>=0} (-x/2)^n * (A(x)^n + (-1)^n)^n.at n=6A360949
- Numbers k such that 4^k - prime(k) is prime.at n=9A379694