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.
%I A262508 #12 Oct 02 2015 12:13:21 %S A262508 0,9236,9237,9238,9247,9248,9330,9331,9353,9356,9357,9358,9385,9388, %T A262508 9399,9407,9446,9453,9476,9477,9478,9480,9481,9547,9561,9590,9626, %U A262508 9652,9653,9655,9656,9722,9743,9775,9776,9778,9781,9786,9844,1308289,1308290,1308465,1308468,1308592,1308713,1308717,1308750,1308809,1308815,1309104,1309162,1309214,1309299,1309397,1309464,1309465,1309536,1309537,1309640,1309641,1309642,1309648,1309675,1309714,1309751,1309879,1309883,1310010,1310011 %N A262508 Numbers that occur only once in A155043; positions of zeros in A262505, ones in A262507. %C A262508 Numbers n for which there exists exactly one natural number x from which one can reach zero in n steps by setting first k = x and then repeatedly applying the map where k is replaced with k - A000005(k). See A262509 for the corresponding x's and implications concerning A259934. %C A262508 Starting offset is zero, because a(0) = 0 is a special case in this sequence. %o A262508 (PARI) \\ See the Pari-program given in A262509, which also computes the terms of this sequence at the same time. %Y A262508 Cf. A000005, A049820, A155043, A259934, A262505, A262507. %Y A262508 Cf. A262509, A262510. %K A262508 nonn %O A262508 0,2 %A A262508 _Antti Karttunen_, Sep 25 2015