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A044126 Numbers n such that string 4,0 occurs in the base 6 representation of n but not of n-1. 1
24, 60, 96, 132, 144, 168, 204, 240, 276, 312, 348, 360, 384, 420, 456, 492, 528, 564, 576, 600, 636, 672, 708, 744, 780, 792, 816, 852, 864, 924, 960, 996, 1008, 1032, 1068, 1104, 1140, 1176, 1212, 1224, 1248, 1284, 1320, 1356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms == 4*6^k (mod 6^(k+1)) for some k >= 1. However, not all numbers of this form are in the sequence, e.g., 888. - Robert Israel, Jun 13 2018

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

N:= 10^4: # for all terms <= N

filter:= proc(n) local L;

    L:= convert(n-1, base, 6);

    select(t -> L[t]=0 and L[t+1]=4, [$1..nops(L)-1])=[]

end proc:

S:= convert(`union`(seq({seq(i, i=4*6^k .. N, 6^(k+1))}, k=1..floor(log[6](N/4)))), list):

sort(select(filter, S)); # Robert Israel, Jun 13 2018

CROSSREFS

Sequence in context: A255968 A211325 A290303 * A044507 A101860 A163636

Adjacent sequences:  A044123 A044124 A044125 * A044127 A044128 A044129

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)