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 A327700 Primes p such that p + q*(q-p) and q + p*(q-p) are prime, where q is the next prime after p. 1
 2, 3, 5, 23, 59, 61, 83, 151, 233, 263, 269, 293, 373, 401, 433, 503, 541, 619, 701, 971, 1103, 1433, 1493, 1601, 1621, 1861, 1949, 2099, 2179, 2371, 2441, 2543, 2741, 2851, 2903, 2999, 3083, 3181, 3313, 3413, 3559, 3631, 4073, 4093, 4549, 4591, 4643, 5039, 5081, 5471, 5711, 5749 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE R:= NULL: count:= 0: q:= 2: do p:= q; q:= nextprime(p); if isprime(p+(q-p)*q) and isprime(q+(q-p)*p) then count:= count+1; R:= R, p; if count = 100 then break fi fi od: R; MATHEMATICA Do[a=Prime[k]+Prime[k+1]*(Prime[k+1]-Prime[k]); b=Prime[k+1]+Prime[k]*(Prime[k+1]-Prime[k]); If[PrimeQ[a]&&PrimeQ[b], Print[Prime[k]]], {k, 1, 757}] (* Metin Sariyar, Sep 23 2019 *) chpQ[{a_, b_}]:=AllTrue[{a+b(b-a), b+a(b-a)}, PrimeQ]; Select[Partition[ Prime[ Range[800]], 2, 1], chpQ][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 05 2021 *) CROSSREFS Includes A174920. Sequence in context: A080016 A171432 A214703 * A182976 A042363 A208220 Adjacent sequences: A327697 A327698 A327699 * A327701 A327702 A327703 KEYWORD nonn AUTHOR J. M. Bergot and Robert Israel, Sep 22 2019 STATUS approved

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Last modified May 18 03:12 EDT 2024. Contains 372617 sequences. (Running on oeis4.)