Lesser of twin primes p for which phi(p-1) = phi(p+1), where phi(n) is the Euler totient function (A000010).

A303549

Lesser of twin primes p for which phi(p-1) = phi(p+1), where phi(n) is the Euler totient function (A000010).

Terms

    a(0) =5a(1) =11a(2) =71a(3) =2591a(4) =208391a(5) =16692551a(6) =48502931a(7) =92012201a(8) =249206231a(9) =419445251a(10) =496978301a(11) =1329067391a(12) =1837151681a(13) =2277479051a(14) =2647600061a(15) =4733566391a(16) =6435087011a(17) =10327948751a(18) =14089345691a(19) =14923624031a(20) =22415286251a(21) =27508270301a(22) =39662281331a(23) =59013882071a(24) =70353395351

External references