A037316 - OEIS

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A037316

Numbers whose base-4 and base-5 expansions have the same digit sum.

1, 2, 3, 28, 29, 40, 41, 42, 43, 52, 53, 54, 76, 77, 78, 79, 90, 91, 100, 101, 102, 103, 115, 136, 137, 138, 139, 160, 161, 162, 163, 188, 189, 210, 211, 236, 237, 238, 239, 270, 271, 280, 281, 282, 283, 295, 305, 306, 307, 330, 331

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

OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

filter:= n -> convert(convert(n, base, 4), `+`)=convert(convert(n, base, 5), `+`):

select(filter, [$1..1000]); # Robert Israel, Mar 11 2018

MATHEMATICA

Select[Range[400], Total[IntegerDigits[#, 4]]==Total[IntegerDigits[#, 5]]&] (* Harvey P. Dale, Sep 15 2018 *)

PROG

(PARI) isok(k) = sumdigits(k, 4) == sumdigits(k, 5); \\ Michel Marcus, Jun 02 2021