Numbers n such that n-th prime - phi(n) - d(n) = (n+1)-th prime - phi(n+1) - d(n+1), where d(n) = number of divisors of n.

A063690

Numbers n such that n-th prime - phi(n) - d(n) = (n+1)-th prime - phi(n+1) - d(n+1), where d(n) = number of divisors of n.

Terms

    a(0) =1a(1) =12a(2) =20a(3) =44a(4) =68a(5) =74a(6) =146a(7) =284a(8) =2204a(9) =6884a(10) =61454a(11) =82934a(12) =407924a(13) =2792144a(14) =3988424a(15) =8380448a(16) =37762394a(17) =191916944a(18) =206846955a(19) =705182864a(20) =867648044a(21) =874419272a(22) =874628864

External references