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A247166 Numbers n such that 15^n+4 is prime. 2
0, 1, 2, 7, 10, 39, 42, 201, 225, 551 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

No further terms up to 10000.

No further terms up to 10^5. - Tyler NeSmith, Jan 21 2021

LINKS

Table of n, a(n) for n=0..9.

MATHEMATICA

a247166[n_Integer] := Select[Range[n], PrimeQ[15^# + 4] &]; a247166[10^4] (* Michael De Vlieger, Dec 03 2014 *)

PROG

(PARI) for(n=0, 1e5, if(ispseudoprime(15^n+4), print1(n, ", ")))

(MAGMA) [n: n in [0..300] | IsPrime(15^n+4)]; // Vincenzo Librandi, Dec 01 2015

CROSSREFS

Corresponding sequences for k^n+4: A058958 (k=3), A124621 (k=5), A096305 (k=7), A217384 (k=9), A137236 (k=13), A243397 (k=19).

Sequence in context: A293002 A056656 A151346 * A110739 A179117 A133154

Adjacent sequences:  A247163 A247164 A247165 * A247167 A247168 A247169

KEYWORD

nonn,more

AUTHOR

Felix Fröhlich, Dec 01 2014

STATUS

approved

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Last modified October 24 11:34 EDT 2021. Contains 348225 sequences. (Running on oeis4.)