19879

Appears in sequences

• Denominators of continued fraction convergents to sqrt(560).at n=8A042073
• Take pairs (a, b), sorted on a, such that T(a)+T(b)=concatenation of a and b, where T(k) is the k-th triangular number A000217(k). Sequence gives values of a.at n=34A096031
• a(n) is the total sum of the digits of n-digit primes.at n=3A130817
• Values of n such that L(14) and N(14) are both prime, where L(k) = (n^2+n+1)*2^(2*k) + (2*n+1)*2^k + 1, N(k) = (n^2+n+1)*2^k + n.at n=49A227517
• Odd composite numbers n, such that n, n+d, n*d and n/d are all odious (A000069) for every divisor d of n.at n=32A231558
• Expansion of F(x^2, x) where F(x,y) is the g.f. of A239927.at n=74A239928
• Composites c for which an integer 1 < k < c exists such that (c-k)! == -1 (mod c).at n=35A256519
• Numbers k such that the factor method (A064097) for computing the k-th power has fewer multiplications than Knuth's power tree method (A114622).at n=0A256653
• Expansion of 1/(1 - Sum_{k>=1} mu(k)^2*x^k/(1 - x^k)^2).at n=10A307073
• Numbers k such that k, k+1, k+2 and k+3 are all sums of a positive square and a positive cube.at n=4A329807
• Expansion of Sum_{k>=0} (k^k * x)^k/(1 - k^k * x)^(k+1).at n=3A355466
• Expansion of Sum_{k>=0} (k^3 * x)^k/(1 - x)^(k+1).at n=3A355493