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A290634 Positive integers which are never the quotient of phi(n)/tau(n). 0
17, 19, 31, 38, 47, 59, 61, 62, 71, 85, 91, 101, 103, 107, 109, 118, 121, 133, 137, 149, 151, 157, 167, 181, 187, 197, 211, 217, 218, 223, 227, 229, 241, 247, 257, 259, 263, 266, 269, 271, 283, 289, 305, 311, 313, 314, 317, 327, 331, 334, 337, 347, 349, 353, 355, 361, 367 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

Numbers that do not appear in A175667.

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

LINKS

Table of n, a(n) for n=1..57.

CROSSREFS

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

Sequence in context: A045803 A098933 A145485 * A182570 A292237 A085106

Adjacent sequences:  A290631 A290632 A290633 * A290635 A290636 A290637

KEYWORD

nonn

AUTHOR

Bernard Schott, Aug 08 2017

STATUS

approved

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Last modified April 22 10:36 EDT 2019. Contains 322330 sequences. (Running on oeis4.)