A338700 - OEIS

%I #20 Jun 04 2021 13:19:52

%S 2,2,2,1433849,9816899,445480319,298098924131,1372604395439

%N Start of the first run of n or more consecutive primes which are Sophie Germain primes.

%H Carlos Rivera, <a href="https://www.primepuzzles.net/puzzles/puzz_071.htm">Puzzle 71. Consecutive primes and Cunningham chains</a>, The Prime Puzzles and Problems Connection.

%e a(4) = 1433849 because 1433849, 1433891, 1433903, 1433909 are four consecutive primes and they are terms of A005384. The sequence of numbers with this property is 1433849, 1989329, 2227853, ... and 1433849 is the first term.

%Y Cf. A005384, A047989, A339474, A339477.

%K nonn,more

%O 1,1

%A _Metin Sariyar_, Apr 24 2021

%E a(8) from _Martin Ehrenstein_, Apr 29 2021