Indices n of primes p(n), p(n+4) such that p(n)+1 and p(n+4)+1 have the same largest prime factor.

Terms

a(0) =1a(1) =3a(2) =5a(3) =16a(4) =64a(5) =85a(6) =266a(7) =547a(8) =1709a(9) =1771a(10) =4415a(11) =9545a(12) =13129a(13) =24130a(14) =34201a(15) =213122a(16) =396981a(17) =543586a(18) =555301a(19) =609182a(20) =1040051a(21) =1870869a(22) =2547634a(23) =3052012a(24) =5076662a(25) =8530768a(26) =9773479a(27) =18563382a(28) =26505870a(29) =89046072