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A136365
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Numbers k such that A075986(k) is prime.
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6
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..8.
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MATHEMATICA
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f=1; Do[ p=Prime[n]; f=f + 1/p^2; g=Numerator[ f ]; If[ PrimeQ[ g ], Print[ {n, g} ] ], {n, 1, 210} ]
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CROSSREFS
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Cf. A075986 (numerator of 1 + 1/p(1)^2 + ... + 1/p(n)^2, where p(k) = prime(k)).
Cf. A024528, A125707.
Cf. A136366, A136367, A136368, A136369, A136370, A136371.
Sequence in context: A045149 A031511 A101273 * A031900 A349097 A120819
Adjacent sequences: A136362 A136363 A136364 * A136366 A136367 A136368
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KEYWORD
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nonn,hard,more
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AUTHOR
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Alexander Adamchuk, Dec 27 2007
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EXTENSIONS
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a(4)-a(8) from Robert Price, Aug 26 2019
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STATUS
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approved
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