Numbers k such that phi(k + 13) | sigma(k).

Terms

a(0) =5a(1) =7a(2) =15a(3) =21a(4) =23a(5) =35a(6) =47a(7) =71a(8) =77a(9) =87a(10) =132a(11) =155a(12) =191a(13) =263a(14) =295a(15) =297a(16) =310a(17) =357a(18) =359a(19) =428a(20) =431a(21) =437a(22) =479a(23) =503a(24) =527a(25) =595a(26) =638a(27) =660a(28) =719a(29) =759