A290634 - OEIS

%I #26 Aug 17 2020 11:05:56

%S 17,19,31,38,47,59,61,62,71,85,91,101,103,107,109,118,121,133,137,149,

%T 151,157,167,181,187,197,211,217,218,223,227,229,241,247,257,259,263,

%U 266,269,271,283,289,305,311,313,314,317,327,331,334,337,347,349,353,355,361,367

%N Positive integers which are never the quotient of phi(n)/tau(n).

%C For phi(n)/tau(n) see A279287/A279288.

%C Numbers that do not appear in A175667.

%C The first nine terms of this sequence are exactly A119480(3) through A119480(11), and many other terms are common to these two sequences.

%Y Cf. A000010, A000005, A020491, A015733, A020488, A062516, A175667, A112954, A112955, A119480, A289585, A279287/A279288.

%K nonn

%O 1,1

%A _Bernard Schott_, Aug 08 2017