A037374 Positive numbers k such that every base-2 digit of k is a base-5 digit of k.

1, 5, 7, 25, 26, 27, 28, 29, 30, 31, 35, 40, 45, 51, 55, 76, 80, 101, 105, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155

Offset

1,2

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Prog

(Haskell)
import Data.List ((\\), nub)
a037374 n = a037374_list !! (n-1)
a037374_list = filter f [1..] where
   f x = null $ nub (ds 2 x) \\ nub (ds 5 x)
   ds b x = if x > 0 then d : ds b x' else []  where (x', d) = divMod x b
-- Reinhard Zumkeller, May 30 2013

Crossrefs

Cf. A037372, A037373, A037375, A037376, A037377, A037378, A037379.

Sequence in context: A357852 A166660 A354202 * A056717 A072370 A057490

Adjacent sequences: A037371 A037372 A037373 * A037375 A037376 A037377

Keyword

nonn,base

Author

Clark Kimberling

Status

approved