A257473 Composite numbers whose digits appear in their prime factors.

22, 33, 55, 77, 95, 122, 132, 155, 202, 222, 272, 303, 312, 322, 326, 332, 333, 344, 366, 399, 505, 515, 555, 707, 731, 735, 777, 912, 955, 973, 995, 1010, 1030, 1070, 1090, 1111, 1112, 1122, 1131, 1133, 1155, 1173, 1177, 1192, 1197, 1199, 1202, 1212, 1222

Offset

1,1

Links

Table of n, a(n) for n=1..49.

L. Blomberg, in reply to E. Angelini, Any digit of a(n) is visible in a(n)'s factorization, April 29, 2015.

Example

See the link.

Prog

(PARI) is(n)=!isprime(n)&&n>1&&!#setminus(Set(digits(n)), Set(concat(apply(f->digits(f), factor(n)[, 1]~)))) \\ M. F. Hasler, May 08 2015

Crossrefs

Sequence in context: A026044 A120146 A138840 * A116063 A131317 A176597

Adjacent sequences: A257470 A257471 A257472 * A257474 A257475 A257476

Keyword

nonn,base

Author

Eric Angelini and M. F. Hasler, May 08 2015

Status

approved