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A136365 Numbers k such that A075986(k) is prime. 6
1, 171, 210, 550, 1445, 1809, 2176, 2719 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
MATHEMATICA
f=1; Do[ p=Prime[n]; f=f + 1/p^2; g=Numerator[ f ]; If[ PrimeQ[ g ], Print[ {n, g} ] ], {n, 1, 210} ]
CROSSREFS
Cf. A075986 (numerator of 1 + 1/p(1)^2 + ... + 1/p(n)^2, where p(k) = prime(k)).
Sequence in context: A045149 A031511 A101273 * A031900 A349097 A120819
KEYWORD
nonn,hard,more
AUTHOR
Alexander Adamchuk, Dec 27 2007
EXTENSIONS
a(4)-a(8) from Robert Price, Aug 26 2019
STATUS
approved

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Last modified May 18 15:50 EDT 2024. Contains 372664 sequences. (Running on oeis4.)