Indices n of primes p(n), p(n+2) such that p(n)+1 and p(n+2)+1 have the same largest prime factor.
A105404
Indices n of primes p(n), p(n+2) such that p(n)+1 and p(n+2)+1 have the same largest prime factor.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =8a(6) =22a(7) =23a(8) =259a(9) =3598a(10) =4808a(11) =7715a(12) =8821a(13) =9155a(14) =10765a(15) =29745a(16) =1776197a(17) =2417850a(18) =11568019a(19) =1617124497a(20) =5632000774
External references
- oeis: A105404