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

Offset

1,1

Links

Table of n, a(n) for n=1..67.

Crossrefs

Cf. A062584, A068164, A068165.

Sequence in context: A073083 A129508 A015728 * A087217 A044972 A132313

Adjacent sequences: A080467 A080468 A080469 * A080471 A080472 A080473

Keyword

base,nonn

Author

Amarnath Murthy, Mar 07 2003

Extensions

Corrected and extended by Ray Chandler, Oct 11 2003

Status

approved