A249611 Integers that reach the (15, 8) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).

2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 22, 23, 24, 27, 28, 29, 30, 34, 37, 38, 39, 40, 51, 55, 56, 59, 60, 65, 66, 70, 71, 72, 75, 78, 83, 84, 85, 86, 87, 89, 90, 94, 95, 107, 108, 109, 110, 111, 113, 114, 117, 118, 120, 123, 124, 131, 132

Offset: 1

Author

Michel Marcus, Nov 02 2014

Keywords

• nonn

Crossrefs

Cf. A017665, A234534, A249612, A249613, A249614.

Programs

PARI

finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
lista(nn, targ=15) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}