202589

Appears in sequences

• n^2 * (n^3 + 2n^2 + 7n - 2) / 8.at n=17A106845
• Numbers being the smallest positive integer having its digits (Cf. A179239) from which two digits can be chosen, the difference being any value from 0 to 9.at n=11A365375
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, n) )^2.at n=19A371492