Primes p such that there exists prime q < p such that sigma(p+1) = sigma(q+1) = p + q.

Terms

a(0) =37a(1) =34687a(2) =65587a(3) =2089951a(4) =8161477a(5) =8340613a(6) =18927067a(7) =25855567a(8) =64346413a(9) =95150203a(10) =238973101a(11) =257658061a(12) =277743397a(13) =322210813a(14) =349883707a(15) =578403913a(16) =704710543a(17) =1121445337a(18) =1654635937a(19) =1741780693a(20) =1804380007a(21) =1963734061a(22) =2346701941a(23) =2360966173a(24) =2720420707a(25) =3232299517a(26) =4343250181a(27) =4925742973a(28) =8085909913a(29) =9044601133