A289725 Primes of the form 3^k - 26.

2161, 59023, 1594297, 31381059583, 7625597484961, 205891132094623, 1570042899082081611640534537, 381520424476945831628649898783, 66555937033867822607895549241096482953017615834735226137

Offset: 1

Author

Robert Price, Sep 02 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..10
• F. Firoozbakht and M. F. Hasler, Variations on Euclid's formula for Perfect Numbers, JIS 13 (2010) #10.3.1.
• Henri and Renaud Lifchitz, PRP Records
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A000040, A219045 (corresponding k's).

Programs

Mathematica

Select[Table[3^k - 26, {k, 3, 100}], PrimeQ[#] &]

Formula

a(n) = 3^A219045(n) - 26. - Elmo R. Oliveira, Nov 12 2023