A238664 Primes p such that (p+2)^2+2 is prime but (p+1)^2+1 is not prime.

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

Offset: 1

Author

Alois P. Heinz, Mar 02 2014

Keywords

• nonn

Links

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

Crossrefs

Column k=2 of A238086.

Programs

Mathematica

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