A020334 Numbers whose base-6 representation is the juxtaposition of two identical strings.

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

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

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

Cf. A020330, A020331, A020332, A020333, A020335, A020336, A020337, A020338.

Sequence in context: A187395 A033019 A031483 * A044832 A033004 A189931

Adjacent sequences: A020331 A020332 A020333 * A020335 A020336 A020337

Keyword

nonn,base

Author

David W. Wilson, Melia Aldridge (ma38(AT)spruce.evansville.edu)

Status

approved