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A020334 Numbers whose base-6 representation is the juxtaposition of two identical strings. 7
7, 14, 21, 28, 35, 222, 259, 296, 333, 370, 407, 444, 481, 518, 555, 592, 629, 666, 703, 740, 777, 814, 851, 888, 925, 962, 999, 1036, 1073, 1110, 1147, 1184, 1221, 1258, 1295, 7812, 8029, 8246, 8463, 8680, 8897, 9114, 9331, 9548, 9765, 9982, 10199, 10416 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = n*6^floor(log_6(n)+1) + n. - Ilya Gutkovskiy, Jan 26 2018
EXAMPLE
296_10 = 1212_6. - Jon E. Schoenfield, Feb 11 2021
MATHEMATICA
jtiQ[n_]:=Module[{idn6=IntegerDigits[n, 6], len}, len=Length[idn6]; EvenQ[ len] && Take[idn6, len/2]==Take[idn6, (-len/2)]]; Select[ Range[ 11000], jtiQ] (* Harvey P. Dale, May 29 2016 *)
a[n_] := n + n*6^Floor[Log[6, n] + 1]; Array[a, 50] (* Amiram Eldar, Apr 06 2021 *)
CROSSREFS
Sequence in context: A187395 A033019 A031483 * A044832 A033004 A189931
KEYWORD
nonn,base
AUTHOR
David W. Wilson, Melia Aldridge (ma38(AT)spruce.evansville.edu)
STATUS
approved

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Last modified March 1 22:23 EST 2024. Contains 370443 sequences. (Running on oeis4.)