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A237607 Numbers divisible by a square and which have the same property if any number of rightmost digits is deleted. 2
4, 8, 9, 40, 44, 45, 48, 49, 80, 81, 84, 88, 90, 92, 96, 98, 99, 400, 404, 405, 408, 440, 441, 444, 448, 450, 452, 456, 459, 480, 484, 486, 488, 490, 492, 495, 496, 800, 801, 804, 808, 810, 812, 816, 819, 840, 841, 844, 845, 846, 847, 848, 880, 882, 884, 888 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This regards the interplay between an endomorphism E on the set N and a number property P. In this case, E(n)=floor(n/10) for n >=10 and E(n)=n otherwise, and the property P is "moebius(n)=0". The goal is to find the numbers whose consecutive images under E all have the property P.

LINKS

Stanislav Sykora, Table of n, a(n) for n = 1..20000

Stanislav Sykora, PARI/GP scripts for genetic threads

PROG

(PARI) See the link (use GT_DivMod0 with "IsMoebiusZero" for the "property" argument).

CROSSREFS

Subsequence of A013929.

Sequence in context: A076705 A162752 A076966 * A035132 A077572 A239520

Adjacent sequences:  A237604 A237605 A237606 * A237608 A237609 A237610

KEYWORD

nonn,base

AUTHOR

Stanislav Sykora, Feb 15 2014

STATUS

approved

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Last modified May 22 16:19 EDT 2017. Contains 286882 sequences.