1,2

All entries lack the digit 9, because this digit is absent in the representations in bases 2 to 9.

Table of n, a(n) for n=1..15.

13 is 31 in base 4. 23 is 32 in base 7. 46 is 64 in base 7.

Cf. A034294, A090144. - R. J. Mathar, Jul 17 2009

Sequence in context: A200374 A033080 A090144 * A250476 A222260 A032991

Adjacent sequences: A162569 A162570 A162571 * A162573 A162574 A162575

nonn,base

Claudio Meller, Jul 06 2009

Keyword:base, single-digit numbers and 313725 added by R. J. Mathar, Jul 17 2009

approved