A050622 - OEIS

A050622

Numbers m that are divisible by 2^k, where k is the digit length of m.

2, 4, 6, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248, 256, 264, 272, 280, 288, 296, 304, 312, 320, 328, 336, 344, 352, 360

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OFFSET

1,1

COMMENTS

The number of terms of length k is equal to (9*5^(k-1) - 1)/2. - Bernard Schott, Apr 06 2020

LINKS

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

MAPLE

seq(seq(j*2^k, j=(5^(k-1)+1)/2 .. 5^k-1), k=1..3); # Robert Israel, Apr 05 2020

MATHEMATICA

Select[Range[360], IntegerQ[#/2^IntegerLength[#]] &] (* Jayanta Basu, May 25 2013 *)

PROG