Numbers n such that phi(n) = phi(n+7), with Euler's totient function phi = A000010.

Terms

a(0) =5a(1) =7a(2) =21a(3) =45a(4) =75a(5) =105a(6) =285a(7) =488a(8) =585a(9) =765a(10) =1148a(11) =1275a(12) =1358a(13) =1785a(14) =2528a(15) =3465a(16) =4088a(17) =6825a(18) =9405a(19) =12375a(20) =14348a(21) =15345a(22) =16208a(23) =16988a(24) =23648a(25) =25905a(26) =25935a(27) =42698a(28) =50018a(29) =52845