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A262972 Numbers k such that 4^k + 33 is prime. 1
1, 3, 6, 7, 10, 15, 30, 34, 54, 58, 103, 105, 205, 223, 279, 741, 2098, 3523, 9210, 37674, 89895, 101509, 217123 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Contains exactly the halved even terms of A247953.
The next terms are > 2*10^5.
LINKS
EXAMPLE
For k = 30, 4^30 + 33 = 1152921504606847009 is prime.
MATHEMATICA
Select[Range[0, 250000], PrimeQ[4^# + 33] &]
PROG
(Magma) [n: n in [0..700] | IsPrime(4^n+33)]; // Vincenzo Librandi, Oct 06 2015
(PARI) for(n=1, 1e3, if(isprime(4^n+33), print1(n", "))) \\ Altug Alkan, Oct 06 2015
CROSSREFS
Cf. A247953, A253772 (similar sequence).
Sequence in context: A285569 A024412 A255508 * A115127 A258354 A164557
KEYWORD
nonn,more
AUTHOR
Robert Price, Oct 05 2015
EXTENSIONS
a(23) derived from A247953 by Elmo R. Oliveira, Nov 28 2023
STATUS
approved

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Last modified April 12 09:56 EDT 2024. Contains 371627 sequences. (Running on oeis4.)