Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.
A098271
Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.
Terms
- a(0) =1a(1) =15a(2) =35a(3) =65a(4) =91a(5) =255a(6) =377a(7) =559a(8) =1295a(9) =2001a(10) =2059a(11) =2431a(12) =4081a(13) =7743a(14) =8911a(15) =10745a(16) =12851a(17) =22791a(18) =26335a(19) =39689a(20) =51271a(21) =61699a(22) =65535a(23) =73151a(24) =95201a(25) =97681a(26) =112897a(27) =114191a(28) =139231a(29) =150177
External references
- oeis: A098271