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A253380 Numbers k such that 17^k + 4 is prime. 0
0, 2, 6, 18, 7238 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
No further terms up to 10000.
No further terms up to 37200. - Michael S. Branicky, Mar 22 2023
LINKS
EXAMPLE
For k = 0: 17^0 + 4 = 5, which is prime, so 0 is a term of the sequence.
For k = 2: 17^2 + 4 = 293, which is prime, so 2 is a term of the sequence.
MATHEMATICA
Select[Range@10^5, PrimeQ[17^# + 4] &] (* Michael De Vlieger, Jan 03 2015 *)
PROG
(PARI) for(n=0, 1e5, if(ispseudoprime(17^n+4), print1(n, ", ")))
CROSSREFS
Corresponding sequences for k^n+4: A058958 (k=3), A124621 (k=5), A096305(k=7), A217384 (k=9), A137236 (k=13), A247166 (k=15), A243397 (k=19).
Sequence in context: A064535 A240643 A262971 * A128123 A227884 A186769
KEYWORD
nonn,more
AUTHOR
Felix Fröhlich, Dec 31 2014
STATUS
approved

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Last modified February 25 10:32 EST 2024. Contains 370321 sequences. (Running on oeis4.)