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A168000 Numbers n with property that first digit of 6*n = last digit of n. 4
21, 31, 42, 53, 63, 74, 85, 95, 106, 116, 117, 127, 138, 148, 159, 171, 181, 191, 201, 211, 221, 231, 241, 251, 261, 271, 281, 291, 301, 311, 321, 331, 342, 352, 362, 372, 382, 392, 402, 412, 422, 432, 442, 452, 462, 472, 482, 492, 503, 513, 523, 533, 543 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..1000

EXAMPLE

6*21=126, 6*31=186, 6*42=252, 6*53=318, etc.

MATHEMATICA

Reap[Do[If[IntegerDigits[n][[ -1]]==IntegerDigits[6*n][[1]], Sow[n]], {n, 1000}]][[2, 1]]

Select[Range[600], Mod[#, 10]==First[IntegerDigits[6#]]&] (* Harvey P. Dale, Jan 09 2014 *)

CROSSREFS

Cf. A167994, A167996, A167997, A167998.

Sequence in context: A261322 A123846 A336383 * A031889 A034101 A034111

Adjacent sequences:  A167997 A167998 A167999 * A168001 A168002 A168003

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Nov 16 2009

STATUS

approved

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Last modified April 14 16:38 EDT 2021. Contains 342949 sequences. (Running on oeis4.)