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A181285 Primes of the form 5^k - 4. 1
3121, 78121, 30517578121, 710542735760100185871124267578121, 413590306276513837435704346034981426782906055450439453121 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
3121 = 5^5 - 4 is prime and therefore is in the sequence.
MAPLE
n:=1000: S:={}: for i from 1 to n do if type(5^i-4, prime)=true then S:=S union {5^i-4} end if od; S;
MATHEMATICA
Select[5^Range[90]-4, PrimeQ] (* Harvey P. Dale, Aug 23 2013 *)
CROSSREFS
Sequence in context: A183850 A002433 A107535 * A133526 A250523 A251061
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified July 19 22:34 EDT 2024. Contains 374441 sequences. (Running on oeis4.)