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

A189057

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

Terms

    a(0) =2a(1) =57a(2) =175a(3) =357a(4) =381a(5) =543a(6) =777a(7) =903a(8) =2379a(9) =3027a(10) =6807a(11) =25823a(12) =47047a(13) =74333a(14) =82621a(15) =136213a(16) =153425a(17) =163471a(18) =194873a(19) =230547a(20) =257799a(21) =259555a(22) =265111a(23) =269545a(24) =285439a(25) =289009a(26) =302403a(27) =305305a(28) =311395a(29) =354365

External references