A080470 - OEIS

A080470

a(n) = smallest composite number that is obtained by placing digits anywhere in n; a(n) = n if n is composite.

10, 12, 30, 4, 15, 6, 27, 8, 9, 10, 110, 12, 123, 14, 15, 16, 117, 18, 119, 20, 21, 22, 123, 24, 25, 26, 27, 28, 129, 30, 231, 32, 33, 34, 35, 36, 237, 38, 39, 40, 141, 42, 143, 44, 45, 46, 147, 48, 49, 50, 51, 52, 153, 54, 55, 56, 57, 58, 159, 60, 161, 62, 63, 64, 65, 66, 267