A247957 Numbers k such that 33^k + 2 is prime.
0, 2, 26, 60, 218, 248, 399, 1175, 1244, 2670, 9300, 45216, 144412
Offset: 1
Links
- Henri & Renaud Lifchitz, PRP Records, search for 33^n+2
Crossrefs
Cf. numbers n such that k^n+2 is prime: A051783 (k=3), A087885 (k=5), A090649 (k=9), A109076 (k=11), A138048 (k=15), A113480 (k=17), A138049 (k=21), A138050 (k=23), A138051 (k=27), A087886 (k=29), this sequence (k=33), A247958 (k=35), A247959 (k=39), A247960 (k=41), A247961 (k=45); (0, 113) for k=47; A247962 (k=51); A247963 (k=57), A113481 (k=59).
Programs
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Magma
[n: n in [0..350]| IsPrime( 33^n + 2 )];
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Maple
A247957:=n->`if`(isprime(33^n+2),n,NULL): seq(A247957(n), n=0..1000); # Wesley Ivan Hurt, Sep 28 2014
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Mathematica
Select[Range[0,1000], PrimeQ[33^# + 2] &]
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PARI
is(n)=ispseudoprime(33^n+2) \\ Charles R Greathouse IV, Feb 17 2017
Extensions
a(8)-a(11) from Jens Kruse Andersen, Sep 29 2014
a(12)-a(13) from Robert Price, Apr 14 2015
Comments