Numbers k that divide Sum_{i=1..k} (i - d(i)), where d(n) is the number of divisors of n (A000005).

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =15a(5) =24a(6) =26a(7) =47a(8) =121a(9) =204a(10) =347a(11) =562a(12) =4204a(13) =6937a(14) =6947a(15) =31108a(16) =379097a(17) =379131a(18) =379133a(19) =2801205a(20) =12554202a(21) =20698345a(22) =56264197a(23) =13767391064a(24) =37423648626a(25) =37423648726a(26) =61701166395a(27) =276525443156a(28) =276525443176a(29) =455913379395