Numbers k such that the numerator of the sum of the reciprocals of the divisors of k (=A017665(k)) is a power of 2.

A043305

Numbers k such that the numerator of the sum of the reciprocals of the divisors of k (=A017665(k)) is a power of 2.

Terms

    a(0) =1a(1) =3a(2) =6a(3) =7a(4) =15a(5) =21a(6) =28a(7) =31a(8) =33a(9) =42a(10) =69a(11) =84a(12) =91a(13) =93a(14) =105a(15) =127a(16) =135a(17) =141a(18) =186a(19) =217a(20) =231a(21) =270a(22) =273a(23) =285a(24) =381a(25) =420a(26) =465a(27) =483a(28) =496a(29) =546

External references