169653

Appears in sequences

• Sum of first n^2 odd primes (=S) is divisible by n and S/n = n mod 2.at n=10A064013
• Triangular numbers T from A000217 such that (4*T+1)/13 is prime.at n=30A208294
• Triangular numbers T such that sum of the factorials of digits of T is prime.at n=37A242831
• Triangular numbers n such that sigma(n) is a square number.at n=14A256151
• Triangular numbers k such that psi(k) is a square, where psi(k) is the Dedekind psi function (A001615).at n=33A292064
• a(n) = [x^(n^2)] (Sum_{k=0..2*n} (k+1)*x^k)^n.at n=4A322514