Numbers n such that phi(n)=phi(n+5), with Euler's totient function phi=A000010.

Terms

a(0) =5a(1) =9a(2) =15a(3) =21a(4) =15556a(5) =21016a(6) =25930a(7) =25935a(8) =27027a(9) =36304a(10) =46683a(11) =129675a(12) =266128a(13) =307923a(14) =329175a(15) =430348a(16) =503139a(17) =636400a(18) =684411a(19) =812170a(20) =1014778a(21) =1252713a(22) =1777545a(23) =1871788a(24) =1892452a(25) =1911987a(26) =2622160a(27) =2629930a(28) =2731360a(29) =2947035