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

1,1

Links

Table of n, a(n) for n=1..61.

Prog

(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, ", ")); ); }

Crossrefs

Cf. A017665, A234534, A249611, A249613, A249614.

Sequence in context: A183401 A300142 A070574 * A260560 A034012 A086121

Adjacent sequences: A249609 A249610 A249611 * A249613 A249614 A249615

Keyword

nonn

Author

Michel Marcus, Nov 02 2014

Status

approved