A117815 Composite numbers at least one of whose decimal digits is prime.

12, 15, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 42, 45, 50, 51, 52, 54, 55, 56, 57, 58, 62, 63, 65, 70, 72, 74, 75, 76, 77, 78, 82, 85, 87, 92, 93, 95, 102, 105, 112, 115, 117, 120, 121, 122, 123, 124, 125, 126, 128, 129, 130, 132, 133

Offset

1,1

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Prog

(Python)
from sympy import isprime
def ok(n): return set(str(n)) & set("2357") != set() and not isprime(n)
print([k for k in range(134) if ok(k)]) # Michael S. Branicky, Dec 15 2021

Crossrefs

Supersequence of A117815.

Cf. A000040, A002808.

Sequence in context: A115349 A196224 A163657 * A154390 A346608 A156683

Adjacent sequences: A117812 A117813 A117814 * A117816 A117817 A117818

Keyword

base,easy,nonn

Author

Giovanni Teofilatto, Apr 30 2006

Extensions

Corrected by Giovanni Teofilatto, May 12 2006

Name edited by Michael S. Branicky, Dec 15 2021

Status

approved