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A136366
Numbers k such that A024530(k) is prime.
6
3, 4, 5, 10, 21, 31, 55, 77, 121, 135, 148, 192, 425, 570, 612, 649, 1293, 2326, 3646
OFFSET
1,1
MATHEMATICA
f=0; Do[ p=Prime[n]; f=f + (-1)^(n+1)*1/p; g=Numerator[f] ; If[ PrimeQ[g], Print[ {n, g} ] ], {n, 1, 150} ]
CROSSREFS
Cf. A024530 (numerator of Sum_{k=1..n} (-1)^k / prime(k)).
Sequence in context: A297661 A342333 A369789 * A123820 A261903 A133320
KEYWORD
nonn,more
AUTHOR
Alexander Adamchuk, Dec 27 2007
EXTENSIONS
a(12)-a(16) from Alexander Adamchuk, Sep 15 2010
a(17)-a(19) from Robert Price, Aug 27 2019
STATUS
approved