42627

Appears in sequences

• Numbers k that divide s(k), where s(1)=1, s(j)=13*s(j-1)+j.at n=36A014861
• Expansion of (1-x)/(1-x-3*x^2).at n=14A052533
• Wieferich numbers (1): n > 1 such that 2^A000010(n) == 1 (mod n^2).at n=9A077816
• a(0)=1, a(1)=3, a(n) = 7*a(n-1) - 9*a(n-2) for n > 1.at n=7A165310
• Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=18A246503
• Numbers n > 1 such that 2^m == 1 (mod n^2), where m = A002326((n-1)/2).at n=8A265630
• Numbers n > 1 such that 2^lambda(n) == 1 (mod n^2), where lambda(n) is the Carmichael lambda function (A002322).at n=9A291961
• Table in which the g.f. of row n, R(n,x), satisfies Sum_{k=-oo..+oo} (-1)^k * (x^k + n*R(n,x))^k = 1 + (n+2)*Sum_{k>=1} (-1)^k * x^(k^2), for n >= 1, as read by antidiagonals.at n=61A370020
• Expansion of g.f. A(x) satisfying Sum_{n=-oo..+oo} (-1)^n * (x^n + 5*A(x))^n = 1 + 7*Sum_{n>=1} (-1)^n * x^(n^2).at n=6A370025