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A230289 Let m = n-th number not divisible by 3 (A001651); a(n) = position of m in A065075, or -1 if never appears in A065075. 2
1, 3, 4, 7, 6, 5, 8, 9, 10, 13, 24, 41, 26, 51, 64, 151, 276, 335, 446, 219, 550, 451, 1674, 1685, 2192, 2667, 9220, 17647, 3972, 9221, 17648, 25311, 35776, 25339, 147018, 112397, 146972, 212667, 243892, 243871, 963024, 1263521, 1838078, 2380569, 2380378 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is believed that a(n) is always > 0.

LINKS

Lars Blomberg, Table of n, a(n) for n = 1..86

Index entries for Colombian or self numbers and related sequences

MAPLE

read transforms; M:=100000; sp:=1; a:=[sp]; s:=sp;

for n from 2 to M do sp:=digsum(s); a:=[op(a), sp]; s:=s+sp; od:

b:=[]:

for n from 1 to 100 do

if (n mod 3) <> 0 then

if member(n, a, 'p') then b:=[op(b), p] else b:=[op(b), -1]; fi;

fi;

od:

b;

CROSSREFS

Cf. A065075, A001651.

Sequence in context: A067342 A322656 A105827 * A023888 A222085 A187793

Adjacent sequences:  A230286 A230287 A230288 * A230290 A230291 A230292

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Oct 17 2013

EXTENSIONS

a(35)-a(45) from Lars Blomberg, Jul 31 2017

STATUS

approved

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Last modified April 23 18:34 EDT 2019. Contains 322387 sequences. (Running on oeis4.)