A067795 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A067795

Numbers n such that 2*n+1 is the next prime after sigma(n).

%I #12 Feb 19 2017 10:12:37

%S 2,6,8,14,44,128,315,2144,32768,55328384,815634435

%N Numbers n such that 2*n+1 is the next prime after sigma(n).

%C a(12) > 3*10^10. - _Donovan Johnson_, May 16 2011

%K nonn,more

%O 1,1

%A _Benoit Cloitre_, Feb 07 2002

%E Added missing term 2 and a(10)-a(11) from _Donovan Johnson_, May 16 2011