Dear SegFans, Right or wrong call sequence as Sophie Germen nonprimes n such that d(n)*n + 1 is prime (d = A000005 and d(n)*n = A038040(n)) : 1, 4, 10, 12, 15, 18, 22, 24, 27, 30, 32, 34, 39, 42, 45, 52, 54, 56, 57, 58, 63, 64, 68, 69, 76, 84, 87,... Tranks, Juri-Stepan Gerasimov.