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A250295
Numbers n such that A005165(n) is a semiprime.
0
9, 11, 12, 17, 18, 23, 26, 31, 62, 64, 67, 76, 78, 84, 87, 88, 123, 125, 131
OFFSET
1,1
COMMENTS
a(20) >= 150. - Max Alekseyev, Aug 26 2021
EXAMPLE
a(1) = 9 so A005165(9) = 326981 = 79 * 4139 is a semiprime.
CROSSREFS
Sequence in context: A202707 A031078 A216292 * A071217 A064930 A158607
KEYWORD
nonn,more
AUTHOR
Eric Chen, Dec 24 2014
EXTENSIONS
a(18)-a(19) from Max Alekseyev, Aug 26 2021
STATUS
approved