668856

Appears in sequences

• Integers n such that 2n^2+1, 2n^3+1, 2n^4+1 and 2n^5+1 are prime.at n=20A239925
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x + 31^2)^2 = y^2.at n=20A331265