501025

Appears in sequences

• a(n) = (1/3)*(n^2 + 2*n + 3)*(n+1)^2.at n=34A014820
• a(1) = 1, a(n) is the number obtained by replacing each digit of a(n-1) with five times its value.at n=4A061583
• Crystal ball sequence for the lattice C_4.at n=17A142993
• Nonsquarefree numbers n = p_1^s_1...p_m^s_m (m > 1) such that (p_i^s_i - 1) | n-1 for all 0 < i <= m.at n=9A292815