A208273 - OEIS

A208273

Composite numbers containing a digit 2.

12, 20, 21, 22, 24, 25, 26, 27, 28, 32, 42, 52, 62, 72, 82, 92, 102, 112, 120, 121, 122, 123, 124, 125, 126, 128, 129, 132, 142, 152, 162, 172, 182, 192, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Subsequence of A011532. Complement of A208272 with respect to A011532.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

filter:= proc(n) not isprime(n) and member(2, convert(n, base, 10)) end proc:

select(filter, [$4..300]); # Robert Israel, Oct 09 2024

MATHEMATICA

Select[Range[300], ! PrimeQ[#] && MemberQ[IntegerDigits[#], 2] &] (* T. D. Noe, Mar 06 2012 *)