A078240 a(n) = smallest multiple of n using only composite digits (0,4,6,8,9).

4, 4, 6, 4, 40, 6, 49, 8, 9, 40, 44, 48, 468, 84, 60, 48, 68, 90, 494, 40, 84, 44, 46, 48, 400, 468, 486, 84, 406, 60, 496, 64, 66, 68, 490, 468, 444, 494, 468, 40, 984, 84, 86, 44, 90, 46, 94, 48, 49, 400, 408, 468, 689, 486, 440, 448, 684, 406, 649, 60

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..10000

Prog

(PARI) a(n)={my(S=Set([1, 2, 3, 5, 7])); forstep(m=n, oo, n, my(d=digits(m)); if(#select(t->setsearch(S, t), d)==0, return(m)))} \\ Andrew Howroyd, Sep 17 2024

Crossrefs

Cf. A001744, A078239, A078250.

Sequence in context: A276683 A247343 A071256 * A296844 A332917 A016710

Adjacent sequences: A078237 A078238 A078239 * A078241 A078242 A078243

Keyword

base,easy,nonn

Author

Amarnath Murthy, Nov 23 2002

Extensions

Corrected and extended by Andrew Howroyd, Sep 17 2024

Status

approved