42665

Appears in sequences

• Numbers k such that 3*2^k + 1 is prime.at n=27A002253
• Numbers k such that (k, sigma(k)) lies on a circle with integral radius centered at the origin, i.e., k^2 + sigma(k)^2 is a square.at n=29A066764
• Odd squarefree numbers n such that the cyclotomic polynomial Phi(n,x) is not coefficient convex.at n=23A146960
• Monotonic ordering of nonnegative differences 9^i-2^j, for 40>= i>=0, j>=0.at n=37A192123
• Monotonic ordering of nonnegative differences 3^i-4^j, for 40>= i>=0, j>=0.at n=41A192147
• Monotonic ordering of nonnegative differences 9^i-4^j, for 40>= i>=0, j>=0.at n=19A192170
• Numbers n such that 3*2^n + 1 is a prime factor of a generalized Fermat number 12^(2^m) + 1 for some m.at n=8A268660
• Numbers k such that 3*2^k + 1 is a prime factor of a generalized Fermat number 7^(2^m) + 1 for some m.at n=9A282943