A104520 Smallest semiprime containing exactly n 1's.

10, 115, 111, 1111, 11111, 1111114, 1111111, 110111111, 1111111141, 11101111111, 11111111111, 1111111111101, 10111111111111, 111111011111111, 1111111111101111, 10111111111111111, 11111111111111111

Offset

1,1

Links

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

Example

a(2)=115 because 115 is the smallest semiprime containing exactly two 1's.

Crossrefs

Sequence in context: A196983 A199908 A185391 * A138845 A079678 A233908

Adjacent sequences: A104517 A104518 A104519 * A104521 A104522 A104523

Keyword

base,nonn

Author

Shyam Sunder Gupta, Apr 24 2005

Status

approved