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A031942 Numbers with no consecutive equal base 4 digits. 9
1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 13, 14, 17, 18, 19, 24, 25, 27, 28, 29, 30, 33, 34, 35, 36, 38, 39, 44, 45, 46, 49, 50, 51, 52, 54, 55, 56, 57, 59, 68, 70, 71, 72, 73, 75, 76, 77, 78, 97, 98, 99, 100, 102, 103, 108, 109, 110, 113, 114, 115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

FORMULA

A031942 = { n | A043278(n)=1 } = A043090 \ {0}. - M. F. Hasler, Jul 23 2013

CROSSREFS

Cf. A000975 (base-2 analog), A031941 or A043089 (base-3 analog), A031943 or A043091 (base-5 analog), A043092, ...,  A043096 (base-6 through base-10 analog).

Sequence in context: A236842 A236860 * A043090 A267302 A023799 A267306

Adjacent sequences:  A031939 A031940 A031941 * A031943 A031944 A031945

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

Edited by Charles R Greathouse IV, Aug 02 2010

STATUS

approved

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Last modified November 19 16:10 EST 2017. Contains 294936 sequences.