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A250296
Number n such that A057137(n) is a semiprime.
0
3, 4, 7, 11, 17, 27, 31, 124, 157, 247
OFFSET
1,1
COMMENTS
First unknown: 397.
EXAMPLE
a(4) = 11 so A057137(11) = 12345678901 = 857 * 14405693 is a semiprime.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Chen, Dec 25 2014
STATUS
approved