A352046 Primes of the form (5*4^k + 1)/3.
2, 7, 107, 6827, 27962027, 1789569707, 114532461227, 7870610804782742022827, 37167908664217705235892863787747269176634027, 9743344248872686121357898884775220131039550286507, 623574031927851911766905528625614088386531218336427, 46011642311937091916231705748513503016340726481135910367750161491995307
Offset: 1
Keywords
Examples
107 is a term because it is a prime and (5*4^3 + 1)/3 = 107.
Programs
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Maple
select(isprime, [(5*4^k+1)/3$k=0..120])[]; # Alois P. Heinz, Mar 01 2022
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Mathematica
Select[(5*4^Range[0,200]+1)/3,PrimeQ] (* Harvey P. Dale, Sep 04 2024 *)
Comments