A106656 Smallest semiprime ending in exactly n 1's.

21, 411, 111, 1111, 11111, 2111111, 1111111, 211111111, 2111111111, 21111111111, 11111111111, 4111111111111, 121111111111111, 511111111111111, 2111111111111111, 81111111111111111, 11111111111111111

Offset

1,1

Links

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

Example

a(2)=411 is a term because 411 is the smallest semiprime ending in exactly two 1's.

Crossrefs

Sequence in context: A219308 A358698 A020534 * A083043 A162807 A097833

Adjacent sequences: A106653 A106654 A106655 * A106657 A106658 A106659

Keyword

base,nonn

Author

Shyam Sunder Gupta, May 12 2005

Status

approved