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

Author

Amarnath Murthy, Nov 23 2002

Keywords

• base
• easy
• nonn

Links

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

Crossrefs

Cf. A001744, A078239, A078250.

Programs

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

Extensions

Corrected and extended by Andrew Howroyd, Sep 17 2024