Positive integers n such that phi(n) - d(n) = phi(n+1) - d(n+1) where d(n) is the number of divisors of n.

A063069

Positive integers n such that phi(n) - d(n) = phi(n+1) - d(n+1) where d(n) is the number of divisors of n.

Terms

    a(0) =45a(1) =104a(2) =345a(3) =3255a(4) =17534a(5) =22935a(6) =70634a(7) =983775a(8) =1025504a(9) =1156701a(10) =2200694a(11) =2619705a(12) =2745765a(13) =4163355a(14) =4447064a(15) =4695704a(16) =6372794a(17) =9718904a(18) =11903775a(19) =23992215a(20) =26879684a(21) =29357475a(22) =37239735a(23) =40588485a(24) =41207144a(25) =42694197a(26) =48615735a(27) =56424555a(28) =76466985

External references