Lower prime of the second gap of 2n between primes.

Terms

a(0) =5a(1) =13a(2) =31a(3) =359a(4) =181a(5) =211a(6) =293a(7) =1933a(8) =1069a(9) =1637a(10) =1951a(11) =2179a(12) =3137a(13) =3271a(14) =4831a(15) =10799a(16) =8467a(17) =12853a(18) =38393a(19) =20809a(20) =34981a(21) =36389a(22) =91033a(23) =73189a(24) =45893a(25) =25471a(26) =40289a(27) =153191a(28) =58831a(29) =102701