A334963 - OEIS

A334963

a(n) is the least positive multiple of n that has at most two distinct digits.

1122, 515, 1144, 525, 212, 535, 1188, 545, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 600, 121, 122, 3444, 744, 500, 252, 889, 4224, 774, 10010, 131, 660, 133, 4422, 4455, 272, 411, 414, 556, 700, 141, 994, 858, 144, 3335, 292, 441, 444, 447, 300, 151, 2888

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

OFFSET

102,1

LINKS

David A. Corneth, Table of n, a(n) for n = 102..10101

FORMULA

a(n) <= A004290(n).

a(n) = n if n is in A031955. - Bernard Schott, May 17 2020

EXAMPLE

a(102) = 1122 as 1122 = 11*102 is the least multiple of 102 that has at most 2 distinct digits.

MATHEMATICA

a[n_] := Module[{k = n}, While[Length @ Select[DigitCount[k, 10], # > 0 &] > 2, k += n]; k]; Array[a, 51, 102] (* Amiram Eldar, May 21 2020 *)