The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A173617 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A173617

Numbers n such that phi(tau(n))= rad(n)
(history; published version)

#11 by Peter Luschny at Fri Jul 12 01:30:48 EDT 2019

STATUS

proposed

approved

#10 by Michel Marcus at Fri Jul 12 01:09:59 EDT 2019

STATUS

editing

proposed

#9 by Michel Marcus at Fri Jul 12 01:09:56 EDT 2019

REFERENCES

P. A. MacMahon, Divisors of numbers and their continuations in the theory of partitions, Proc. London Math. Soc., 19 (1919), 75-113.

LINKS

P. A. MacMahon, <a href="https://doi.org/10.1112/plms/s2-19.1.75">Divisors of numbers and their continuations in the theory of partitions</a>, Proc. London Math. Soc., 19 (1919), 75-113.

#8 by Michel Marcus at Fri Jul 12 01:09:26 EDT 2019

LINKS

W. Sierpinski, <a href="http://matwbn.icm.edu.pl/ksiazki/mon/mon42/mon4204.pdf">Number Of Divisors And Their Sum </a>, Elementary theory of numbers, Warszawa, 1964.

STATUS

approved

editing

#7 by Russ Cox at Fri Mar 30 18:35:52 EDT 2012

AUTHOR

_Michel Lagneau (mn.lagneau2(AT)orange.fr), _, Feb 22 2010

Discussion

Fri Mar 30

18:35

OEIS Server: https://oeis.org/edit/global/205

#6 by Russ Cox at Fri Mar 30 17:35:02 EDT 2012

EXTENSIONS

a(14)-a(17) from _Donovan Johnson (donovan.johnson(AT)yahoo.com), _, Jul 27 2011

Discussion

Fri Mar 30

17:35

OEIS Server: https://oeis.org/edit/global/163

#5 by T. D. Noe at Wed Jul 27 23:34:47 EDT 2011

STATUS

proposed

approved

#4 by Donovan Johnson at Wed Jul 27 23:01:13 EDT 2011

STATUS

editing

proposed

#3 by Donovan Johnson at Wed Jul 27 23:00:27 EDT 2011

DATA

1, 4, 8, 32, 36, 192, 288, 768, 972, 1458, 5120, 13122, 326592, 19531250, 22588608, 46137344, 171532242

COMMENTS

a(18) > 10^10. - Donovan Johnson, Jul 27 2011

CROSSREFS

See Cf. A173320 , A062069 Cf. , A001414, A001222.

EXTENSIONS

a(14)-a(17) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jul 27 2011

STATUS

approved

editing

#2 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

Wikipedia, <a href="http://en.wikipedia.org/wiki/Euler''s_phi_function">Euler's totient function</a>

KEYWORD

nonn,new

nonn