Primes p with f(p), f(f(p)) and f(f(f(p))) all prime, where f(n) = prime(n) - n + 1.

Terms

a(0) =2a(1) =3a(2) =23a(3) =311a(4) =1777a(5) =2341a(6) =2861a(7) =3329a(8) =3833a(9) =4051a(10) =8753a(11) =9007a(12) =11587a(13) =13093a(14) =13309a(15) =14551a(16) =16001a(17) =19687a(18) =23143a(19) =26993a(20) =37309a(21) =41981a(22) =44131a(23) =45491a(24) =54623a(25) =56431a(26) =56821a(27) =57991a(28) =60223a(29) =61643