Numbers k such that 1/phi(x) + 1/phi(y) = 1/phi(k), for some x + y = k and phi(k) is the Euler totient function of k.

A279621

Numbers k such that 1/phi(x) + 1/phi(y) = 1/phi(k), for some x + y = k and phi(k) is the Euler totient function of k.

Terms

    a(0) =1890a(1) =2100a(2) =2310a(3) =3780a(4) =5250a(5) =7770a(6) =10080a(7) =11310a(8) =11550a(9) =11880a(10) =12180a(11) =13230a(12) =13650a(13) =13860a(14) =14190a(15) =14910a(16) =15750a(17) =17640a(18) =18060a(19) =19950a(20) =20460a(21) =20790a(22) =21630a(23) =22050a(24) =22110a(25) =23100a(26) =24090a(27) =24180a(28) =24570a(29) =25410

External references