A249612 Integers that reach the (448, 127, 128, 255, 144, 403) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).
16, 19, 20, 21, 25, 26, 31, 32, 33, 35, 36, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 52, 53, 54, 57, 58, 61, 62, 63, 64, 67, 68, 69, 73, 74, 76, 77, 79, 80, 82, 88, 91, 92, 93, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 112, 115, 116, 119, 122, 125, 126
Offset: 1
Keywords
Programs
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PARI
finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;} lista(nn, targ=127) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}