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A104520 Smallest semiprime containing exactly n 1's. 0
10, 115, 111, 1111, 11111, 1111114, 1111111, 110111111, 1111111141, 11101111111, 11111111111, 1111111111101, 10111111111111, 111111011111111, 1111111111101111, 10111111111111111, 11111111111111111 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 25 19:09 EST 2020. Contains 331249 sequences. (Running on oeis4.)