A262508 Numbers that occur only once in A155043; positions of zeros in A262505, ones in A262507.

0, 9236, 9237, 9238, 9247, 9248, 9330, 9331, 9353, 9356, 9357, 9358, 9385, 9388, 9399, 9407, 9446, 9453, 9476, 9477, 9478, 9480, 9481, 9547, 9561, 9590, 9626, 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

Offset: 0

Author

Antti Karttunen, Sep 25 2015

Keywords

• nonn

Comments

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.

Starting offset is zero, because a(0) = 0 is a special case in this sequence.

Crossrefs

Cf. A000005, A049820, A155043, A259934, A262505, A262507.

Cf. A262509, A262510.

Programs

PARI

\\ See the Pari-program given in A262509, which also computes the terms of this sequence at the same time.