Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).
A092591
Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =6a(6) =7a(7) =12a(8) =15a(9) =16a(10) =18a(11) =30a(12) =31a(13) =60a(14) =88a(15) =106a(16) =126a(17) =520a(18) =606a(19) =1278a(20) =2202a(21) =2280a(22) =3216a(23) =4252a(24) =4422a(25) =9688a(26) =9940a(27) =11212a(28) =19936a(29) =21700
External references
- oeis: A092591