Numbers k such that the arithmetic derivative of the cototient(k) is equal to the totient(k).

A272529

Numbers k such that the arithmetic derivative of the cototient(k) is equal to the totient(k).

Terms

    a(0) =8a(1) =189a(2) =405a(3) =465a(4) =2187a(5) =2565a(6) =3483a(7) =6885a(8) =41283a(9) =46875a(10) =389691a(11) =796875a(12) =13410657a(13) =837134375a(14) =12557032155a(15) =23202024507a(16) =31335628125a(17) =38655885285a(18) =115964116965

External references