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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
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OFFSET
1,1
COMMENTS
First unknown: 397.
LINKS
Table of n, a(n) for n=1..10.
EXAMPLE
a(4) = 11 so
A057137
(11) = 12345678901 = 857 * 14405693 is a semiprime.
CROSSREFS
Cf.
A120819
,
A057137
,
A046461
.
Sequence in context:
A069950
A147869
A319106
*
A279785
A100581
A093090
Adjacent sequences:
A250293
A250294
A250295
*
A250297
A250298
A250299
KEYWORD
nonn
,
base
AUTHOR
Eric Chen
, Dec 25 2014
STATUS
approved
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Last modified August 30 04:38 EDT 2024. Contains 375526 sequences. (Running on oeis4.)