280370

Appears in sequences

• Numbers k such that core(k) = ceiling(sqrt(k)) where core(k) is the squarefree part of k (the smallest integer such that k*core(k) is a square).at n=21A069187
• a(n) = n^2*(n^2+1).at n=23A071253
• Sum of two powers of 23.at n=12A073215
• Composite numbers k such that (k+1)*sigma(k) is a perfect square.at n=28A073586
• Numbers k such that core(k) is equal to the sum of the proper square divisors of k, where core(k) = A007913(k).at n=15A225882
• Numbers of the form p^2 * (p^2 + 1) where p is in A225856.at n=7A225892
• a(n) = n^2*sigma_2(n).at n=23A386745