A075016 - OEIS

A075016

Smallest k such that the concatenation k, k-1,k-2 is divisible by n; or 0 if no such number exists.

2, 2, 2, 4, 2, 2, 2, 4, 4, 2, 12, 4, 105, 2, 2, 4, 7, 4, 18, 22, 2, 12, 11, 4, 27, 118, 4, 106, 21, 2, 23, 14, 12, 34, 2, 4, 112, 18, 105, 22, 15, 2, 39, 34, 7, 14, 9, 4, 141, 52, 7, 118, 58, 4, 12, 106, 18, 50, 38, 22, 10, 54, 106, 14, 157

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OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

a(11) = 12 as 11 divides 121110.

MATHEMATICA

skc[n_]:=Module[{k=2}, While[Mod[FromDigits[Flatten[IntegerDigits/@ Range[ k, k-2, -1]]], n]!=0, k++]; k]; Array[skc, 70] (* Harvey P. Dale, Nov 01 2019 *)

CROSSREFS

Cf. A075113, A075114, A075115, A075117.

Sequence in context: A242310 A102298 A049298 * A279409 A102445 A102430

Adjacent sequences: A075013 A075014 A075015 * A075017 A075018 A075019

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, Sep 01 2002

EXTENSIONS

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003

STATUS

approved