Number n for which phi(n) = phi(n'), where phi is the Euler totient function and n' the arithmetic derivative of n.

A190402

Number n for which phi(n) = phi(n'), where phi is the Euler totient function and n' the arithmetic derivative of n.

Terms

    a(0) =2a(1) =4a(2) =8a(3) =14a(4) =20a(5) =27a(6) =45a(7) =52a(8) =75a(9) =148a(10) =195a(11) =244a(12) =292a(13) =364a(14) =628a(15) =729a(16) =772a(17) =1108a(18) =1196a(19) =1215a(20) =1252a(21) =1406a(22) =1552a(23) =1588a(24) =1684a(25) =1701a(26) =1828a(27) =2164a(28) =2452a(29) =2644

External references