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A250289
Numbers n such that the numerator of Bernoulli(n) (A027641(n)) is a semiprime.
0
20, 24, 26, 34, 38, 40, 64, 72, 74, 114, 118, 144, 192
OFFSET
1,1
EXAMPLE
a(1) = 20 so the numerator of Bernoulli(20) = 174611 = 283 * 617 is a semiprime.
CROSSREFS
Cf. A092132.
Sequence in context: A117737 A062908 A111323 * A114843 A174629 A221651
KEYWORD
nonn
AUTHOR
Eric Chen, Dec 24 2014
STATUS
approved