A262508 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

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.

LINKS

Table of n, a(n) for n=0..68.

PROG

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

CROSSREFS

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

Cf. A262509, A262510.

Sequence in context: A209595 A223303 A031594 * A272596 A189984 A092005

Adjacent sequences: A262505 A262506 A262507 * A262509 A262510 A262511

KEYWORD

nonn

AUTHOR

Antti Karttunen, Sep 25 2015

STATUS

approved