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Primes of the form 3^k - 26.
1

%I #13 Nov 12 2023 12:21:33

%S 2161,59023,1594297,31381059583,7625597484961,205891132094623,

%T 1570042899082081611640534537,381520424476945831628649898783,

%U 66555937033867822607895549241096482953017615834735226137

%N Primes of the form 3^k - 26.

%H Robert Price, <a href="/A289725/b289725.txt">Table of n, a(n) for n = 1..10</a>

%H F. Firoozbakht and M. F. Hasler, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Hasler/hasler2.html">Variations on Euclid's formula for Perfect Numbers</a>, JIS 13 (2010) #10.3.1.

%H Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>

%H OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>

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

%o a(n) = 3^A219045(n) - 26. - _Elmo R. Oliveira_, Nov 12 2023

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

%K nonn

%O 1,1

%A _Robert Price_, Sep 02 2017