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A238664 Primes p such that (p+2)^2+2 is prime but (p+1)^2+1 is not prime. 2
7, 31, 37, 43, 79, 97, 103, 241, 271, 307, 367, 373, 421, 499, 547, 571, 601, 607, 709, 751, 883, 907, 967, 1033, 1129, 1213, 1231, 1237, 1327, 1423, 1597, 1609, 1621, 1747, 1801, 1867, 1933, 1951, 1993, 2017, 2131, 2137, 2203, 2221, 2281, 2287, 2647, 2659 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..10000

MATHEMATICA

Select[Prime[Range[400]], PrimeQ[(#+2)^2+2]&&CompositeQ[(#+1)^2+1]&] (* Harvey P. Dale, Jul 07 2019 *)

CROSSREFS

Column k=2 of A238086.

Sequence in context: A205711 A040064 A241101 * A272201 A325423 A309381

Adjacent sequences:  A238661 A238662 A238663 * A238665 A238666 A238667

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 02 2014

STATUS

approved

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Last modified October 17 06:54 EDT 2021. Contains 348048 sequences. (Running on oeis4.)