A032978 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A032978

Numbers with the property that all pairs of consecutive base-7 digits differ by 0 or 1.

1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 16, 17, 23, 24, 25, 31, 32, 33, 39, 40, 41, 47, 48, 49, 50, 56, 57, 58, 64, 65, 66, 105, 106, 107, 113, 114, 115, 121, 122, 123, 162, 163, 164, 170, 171, 172, 178, 179, 180, 219, 220, 221, 227, 228, 229

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..55.

MATHEMATICA

Select[Range[250], Max[Abs[Differences[IntegerDigits[#, 7]]]]<2&] (* Harvey P. Dale, Jul 25 2011 *)

CROSSREFS

Cf. A007093.

Sequence in context: A190298 A069118 A328933 * A197181 A260352 A049101

Adjacent sequences: A032975 A032976 A032977 * A032979 A032980 A032981

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved