Numbers k such that phi(k+1) = 5*phi(k).

Terms

a(0) =11242770a(1) =18673200a(2) =77805000a(3) =117138840a(4) =122649450a(5) =278023200a(6) =393513120a(7) =881879460a(8) =2177410830a(9) =2364390210a(10) =3440848320a(11) =3919303080a(12) =5151045900a(13) =5836032510a(14) =7284273360a(15) =8029787220a(16) =8505803460a(17) =12998545560a(18) =13081794180a(19) =13759304790a(20) =14031484740a(21) =14104654410