

A173903


Numbers n such that both (2^n+1)^22 and (2^n1)^22 are prime.


0




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..7.


FORMULA

A091513 INTERSECT A091515.  R. J. Mathar, Jul 06 2010


MATHEMATICA

Select[Range[3000], PrimeQ[((2^# + 1)^2  2)]&&PrimeQ[((2^#  1)^2  2)] &] (* Vincenzo Librandi, Aug 21 2014 *)


PROG

(MAGMA) [n: n in [1..400]  IsPrime((2^n1)^22) and IsPrime((2^n+1)^22)]


CROSSREFS

Cf. A091513, A091515.
Sequence in context: A302844 A180630 A173079 * A154785 A090512 A076175
Adjacent sequences: A173900 A173901 A173902 * A173904 A173905 A173906


KEYWORD

nonn,hard,more


AUTHOR

Vincenzo Librandi, Mar 08 2010


EXTENSIONS

Definition clarified by Jon E. Schoenfield, Jun 18 2010


STATUS

approved



