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A136371 Numbers n such that A136370(n) is prime. 6
1, 2, 3, 5, 46, 227, 232, 336, 360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

MATHEMATICA

f=1; Do[ p=Prime[n]; f=f - (-1)^(n+1)*1/p^2; g=Numerator[f] ; If[ PrimeQ[g], Print[ {n, g} ] ], {n, 1, 100} ]

CROSSREFS

Cf. A024530 = Numerator of Sum_{k=1..n} (-1)^k / prime(k). Cf. A136368 = Numerator of Sum[ (-1)^(k+1)*1/Prime[k]^2, {k, 1, n} ] ]. Cf. A136370 = Numerator of 1 - Sum[ (-1)^(k+1)*1/Prime[k]^2, {k, 1, n} ] ]. Cf. A136365, A136366, A136367, A136369.

Sequence in context: A117460 A281252 A208223 * A060380 A062608 A041791

Adjacent sequences:  A136368 A136369 A136370 * A136372 A136373 A136374

KEYWORD

more,nonn

AUTHOR

Alexander Adamchuk, Dec 27 2007

EXTENSIONS

More terms added and edited by Alexander Adamchuk, Sep 15 2010

STATUS

approved

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Last modified January 17 14:12 EST 2019. Contains 319225 sequences. (Running on oeis4.)