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A104690
Smallest semiprime containing exactly n 4's.
0
4, 445, 4414, 44441, 444441, 4444441, 44444441, 444444449, 4444444441, 44444444443, 444444444447, 4444444444443, 44444444444441, 444444444444445, 4444444444444447, 44444444444444447, 444444444444444442
OFFSET
1,1
EXAMPLE
a(2)=445 because 445 is the smallest semiprime containing exactly two 4's.
CROSSREFS
Sequence in context: A217269 A034985 A262102 * A300507 A215220 A035483
KEYWORD
base,nonn
AUTHOR
Shyam Sunder Gupta, Apr 24 2005
STATUS
approved