280371

Appears in sequences

• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=23A059826
• Sum of squares of divisors of square numbers.at n=22A065827
• Numbers k such that k^2 divides 22^k-1.at n=12A128402
• Jordan function ratio J_6(n)/J_2(n).at n=22A194532
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=31A203173