Primes of the form sigma(n) + sigma(n)^2 - 1.

Terms

a(0) =11a(1) =19a(2) =41a(3) =71a(4) =239a(5) =181a(6) =811a(7) =599a(8) =599a(9) =991a(10) =1559a(11) =419a(12) =599a(13) =3659a(14) =991a(15) =3191a(16) =929a(17) =2351a(18) =2969a(19) =2351a(20) =1481a(21) =3659a(22) =3191a(23) =9311a(24) =1979a(25) =2351a(26) =8741a(27) =2969a(28) =14519a(29) =14519