A247958 Numbers n such that 35^n + 2 is prime.

0, 1, 15, 83, 1457, 3959, 5351, 5355, 41359, 50327, 54435

Offset: 1

Author

Vincenzo Librandi, Sep 28 2014

Keywords

• nonn
• more

Comments

After 0, all terms are odd. - Bruno Berselli, Oct 01 2014

a(12) > 2*10^5. - Robert Price, Mar 21 2015

Links

• Henri & Renaud Lifchitz, PRP Top Records, Search for 35^n+2.

Crossrefs

Cf. similar sequences listed in A247957.

Programs

Magma

[n: n in [0..1000]| IsPrime(35^n+2)];

Maple

A247958:=n->`if`(isprime(35^n+2),n,NULL): seq(A247958(n), n=0..1000); # Wesley Ivan Hurt, Sep 30 2014

Mathematica

Select[Range[0, 10000], PrimeQ[35^# + 2] &]

PARI

is(n)=ispseudoprime(35^n+2) \\ Charles R Greathouse IV, Jun 13 2017

Extensions

a(9)-a(11) from Robert Price, Mar 21 2015