login
Prime numbers of the form 5^k - 6.
1

%I #8 Sep 03 2017 21:33:58

%S 19,619,3119,15619,9765619,11102230246251565404236316680908203119,

%T 132348898008484427979425390731194056570529937744140619,

%U 2067951531382569187178521730174907133914530277252197265619,32311742677852643549664402033982923967414535582065582275390619

%N Prime numbers of the form 5^k - 6.

%H Robert Price, <a href="/A290007/b290007.txt">Table of n, a(n) for n = 1..11</a>

%H F. Firoozbakht, 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 & 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[5^k - 6], {k, 2, 100}], PrimeQ[#] &]

%Y Cf. A165701.

%K nonn

%O 1,1

%A _Robert Price_, Sep 03 2017