551853

Appears in sequences

• Numbers m such that m divides 10^m - 1.at n=36A014950
• a(n) = n^4 + n^3 + n^2.at n=27A100019
• Coefficients in q-expansion of (E_2^3*E_4 - 3*E_2^2*E_6 + 3*E_2*E_4^2 - E_4*E_6)/3456, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=9A282213
• Numbers k that divide the smallest number whose sum of digits is k.at n=37A342810
• a(n) = J_9(n)/J_3(n), where J_k is the k-th Jordan totient function.at n=8A381713