A104669 Smallest semiprime containing exactly n 2's.

21, 22, 2122, 20222, 202222, 1222222, 22220222, 122222222, 2222222221, 22222222226, 202222222222, 2222212222222, 22222222222223, 212222222222222, 2222222222212222, 22222222202222222, 202222222222222222

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Example

a(2)=22 because 22 is the smallest semiprime containing exactly two 2's.

Crossrefs

Sequence in context: A041920 A041921 A041922 * A156891 A095459 A324321

Adjacent sequences: A104666 A104667 A104668 * A104670 A104671 A104672

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 24 2005

Status

approved