Primes p such that sigma(k) = phi(prime(k)-1), where p = prime(k).

Terms

a(0) =2a(1) =17a(2) =67a(3) =211a(4) =631a(5) =1051a(6) =1811a(7) =1951a(8) =2287a(9) =2791a(10) =3331a(11) =7297a(12) =10099a(13) =13597a(14) =15739a(15) =19717a(16) =21169a(17) =22153a(18) =41341a(19) =85933a(20) =400051a(21) =2251201a(22) =2991253a(23) =3051751a(24) =4244791a(25) =5713891