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A167997
Numbers n with property that first digit of 4*n = last digit of n.
6
16, 31, 41, 52, 62, 72, 83, 93, 104, 114, 124, 125, 135, 145, 156, 166, 177, 187, 197, 208, 218, 229, 239, 249, 251, 261, 271, 281, 291, 301, 311, 321, 331, 341, 351, 361, 371, 381, 391, 401, 411, 421, 431, 441, 451, 461, 471, 481, 491, 502, 512, 522, 532
OFFSET
1,1
LINKS
EXAMPLE
4*16=64, 4*31=124, 4*41=164, 4*52=208, etc.
MATHEMATICA
Reap[Do[If[IntegerDigits[n][[ -1]]==IntegerDigits[4*n][[1]], Sow[n]], {n, 1000}]][[2, 1]]
Select[Range[100], Last[IntegerDigits[#]] == First[IntegerDigits[4 #]] &] (* G. C. Greubel, Jul 03 2016 *)
CROSSREFS
Sequence in context: A221257 A194122 A257349 * A185979 A185980 A064816
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Nov 16 2009
STATUS
approved