Solutions k of the equation cototient(k) = cototient(k-1) + cototient(k-2) where cototient(k) is A051953.

A332972

Solutions k of the equation cototient(k) = cototient(k-1) + cototient(k-2) where cototient(k) is A051953.

Terms

    a(0) =3a(1) =4a(2) =105a(3) =165a(4) =195a(5) =2205a(6) =2835a(7) =38805a(8) =131145a(9) =407925a(10) =936495a(11) =1025505a(12) =1231425a(13) =1276905a(14) =1788255a(15) =1925565a(16) =2521695a(17) =2792145a(18) =2847585a(19) =3289935a(20) =5003745a(21) =5295885a(22) =5710089a(23) =6315309a(24) =6986889a(25) =13496385a(26) =17168085a(27) =19210065a(28) =20171385a(29) =22348365

External references