19849

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 90 ones.at n=15A031858
• 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=33A096031
• Number of partitions that are "2-close" to being self-conjugate.at n=51A108961
• Numbers n such that primorial(n)/2 - 64 is prime.at n=29A139448
• a(n) = 2*n^3 - 3*n^2 + 5.at n=22A152064
• Partial sums of A006567.at n=38A172463
• Smallest k such that 40^k mod k = n.at n=21A178201
• Numbers n such that 4n+1 is a palindromic prime.at n=42A192261
• Numbers n such that there is an integer k with the property that k^tau(n) = sigma(n).at n=13A225239
• Numerators of coefficients in expansion of (sin(x))/(1 - x - x^2).at n=8A279332
• Number of C4-free graphs (graphs with no induced cycle of length four) with n nodes.at n=8A352068