Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and is divisible by (k+1), that is A065395(k)/(k+1) = (phi(sigma(k))-sigma(phi(k)))/(k+1) is a nonzero integer.
A092586
Numbers k such that sigma(phi(k))-phi(sigma(k)) is nonzero and is divisible by (k+1), that is A065395(k)/(k+1) = (phi(sigma(k))-sigma(phi(k)))/(k+1) is a nonzero integer.
Terms
- a(0) =7a(1) =87a(2) =231a(3) =463a(4) =617a(5) =691a(6) =751a(7) =855a(8) =1059a(9) =1127a(10) =2795a(11) =4819a(12) =11999a(13) =18527a(14) =22481a(15) =75311a(16) =121939a(17) =232901a(18) =256751a(19) =288883a(20) =313919a(21) =371519a(22) =845831a(23) =1285841a(24) =1762799a(25) =1815167a(26) =7195199a(27) =9096191a(28) =40324121a(29) =93070943
External references
- oeis: A092586