Consider a decimal number, n, with k digits. n = d(k)*10^(k-1) + d(k-1)*10^(k-2) + … + d(2)*10 + d_(1). Sequence lists the numbers n that divide s = Sum_{i=1..k} d(i)^d(i).
A243507
Consider a decimal number, n, with k digits. n = d(k)*10^(k-1) + d(k-1)*10^(k-2) + … + d(2)*10 + d_(1). Sequence lists the numbers n that divide s = Sum_{i=1..k} d(i)^d(i).
Terms
- a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =63a(10) =64a(11) =93a(12) =377a(13) =643a(14) =699a(15) =760a(16) =2428a(17) =3435a(18) =13073a(19) =46864a(20) =184405a(21) =208858a(22) =1313290a(23) =2326990a(24) =2868720a(25) =2868741a(26) =18273988a(27) =25265859a(28) =33690905a(29) =87889176
External references
- oeis: A243507