Lesser of twin primes p >= 5 for which phi(p+1)/phi(p-1) reaches record value, where phi(n) is the Euler totient function (A000010).
A326356
Lesser of twin primes p >= 5 for which phi(p+1)/phi(p-1) reaches record value, where phi(n) is the Euler totient function (A000010).
Terms
- a(0) =5a(1) =2381a(2) =3851a(3) =20021a(4) =50051a(5) =52361a(6) =424271a(7) =470471a(8) =602141a(9) =2302301a(10) =6806801a(11) =16926911a(12) =17497481a(13) =69989921a(14) =78278201a(15) =183953771a(16) =242662421a(17) =468818351a(18) =2156564411a(19) =24912037151a(20) =43874931101a(21) =73769375681a(22) =131104243271
External references
- oeis: A326356