cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

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%I A249611 #6 Nov 03 2014 10:47:00
%S A249611 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,
%T A249611 38,39,40,51,55,56,59,60,65,66,70,71,72,75,78,83,84,85,86,87,89,90,94,
%U A249611 95,107,108,109,110,111,113,114,117,118,120,123,124,131,132
%N A249611 Integers that reach the (15, 8) cycle described in A234534, after iterations of numerator(sigma(n)/n) = A017665(n).
%o A249611 (PARI) finalc(x, v) = {while (!vecsearch(v, x), x = numerator(sigma(x)/x)); x;}
%o A249611 lista(nn, targ=15) = {v = [8, 127, 512, 29127]; for (i=2, nn, if (finalc(i, v) == targ, print1(i, ", ")););}
%Y A249611 Cf. A017665, A234534, A249612, A249613, A249614.
%K A249611 nonn
%O A249611 1,1
%A A249611 _Michel Marcus_, Nov 02 2014