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

Offset: 102

Author

David A. Corneth, May 17 2020

Keywords

• nonn
• base
• easy

Examples

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

Links

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

Crossrefs

Cf. A004290, A031955, A181060.

Programs

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 *)

PARI

a(n) = for(i = 1, oo, if(#Set(digits(i*n))<3, return(i*n)))

Formula

a(n) <= A004290(n).

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