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A107295 Numbers k such that prime(k^2) - k^2 is prime. 0
2, 4, 12, 14, 20, 42, 48, 56, 60, 88, 104, 120, 126, 134, 138, 160, 164, 182, 186, 204, 226, 254, 270, 276, 312, 316, 330, 336, 350, 382, 408, 410, 414, 422, 438, 448, 450, 480, 492, 494, 502, 522, 546, 568, 580, 596, 620, 624, 640, 650, 690, 696 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
88 is in the sequence because prime(88^2) - 88^2 = prime(7744) - 7744 = 78977 - 7744 = 71233 = prime(7051).
MATHEMATICA
Select[Range[700], PrimeQ[Prime[#^2]-#^2]&] (* Harvey P. Dale, Jun 20 2015 *)
PROG
(PARI) isok(n) = isprime(prime(n^2) - n^2); \\ Michel Marcus, Oct 09 2013
CROSSREFS
Cf. A064269 (prime(n)-n is prime), A141129 (prime(n^2)-n^2).
Sequence in context: A039587 A194368 A111069 * A039564 A297064 A263466
KEYWORD
nonn
AUTHOR
Zak Seidov, May 20 2005
EXTENSIONS
More terms from Michel Marcus, Oct 09 2013
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)