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#14 by Harvey P. Dale at Sun Mar 10 17:07:33 EDT 2019
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#13 by Harvey P. Dale at Sun Mar 10 17:07:30 EDT 2019
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| MATHEMATICA
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NestList[EulerPhi[#]DivisorSigma[0, #]&, 3, 20] (* Harvey P. Dale, Mar 10 2019 *)
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| STATUS
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approved
editing
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#12 by Bruno Berselli at Tue Jun 26 04:57:13 EDT 2018
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#11 by Michel Marcus at Tue Jun 26 01:36:53 EDT 2018
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#10 by Jon E. Schoenfield at Mon Jun 25 22:31:20 EDT 2018
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#9 by Jon E. Schoenfield at Mon Jun 25 22:31:10 EDT 2018
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| NAME
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a(n) = phi(a(n-1) * )) * number of divisors of a(n-1), a(1)=3.
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| LINKS
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Harry J. Smith, <a href="/A063506/b063506.txt">Table of n, a(n) for n= = 1,...,..148</a>
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| PROG
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(PARI) { for (n=1, 148, if (n>1, a=eulerphi(a)*numdiv(a), a=3); write("b063506.txt", n, " ", a) ) } [From _) ) } \\ _Harry J. Smith_, Aug 24 2009]
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| STATUS
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approved
editing
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Discussion
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| Mon Jun 25
| 22:31
| Jon E. Schoenfield: added missing parenthesis; is this okay now?
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#8 by N. J. A. Sloane at Fri Dec 15 17:35:22 EST 2017
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| AUTHOR
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_Jason Earls (zevi_35711(AT)yahoo.com), _, Aug 09 2001
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Discussion
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| Fri Dec 15
| 17:35
| OEIS Server: https://oeis.org/edit/global/2722
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#7 by Russ Cox at Fri Mar 30 17:24:24 EDT 2012
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| PROG
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(PARI) { for (n=1, 148, if (n>1, a=eulerphi(a)*numdiv(a), a=3); write("b063506.txt", n, " ", a) ) } [From _Harry J. Smith (hjsmithh(AT)sbcglobal.net), _, Aug 24 2009]
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Discussion
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| Fri Mar 30
| 17:24
| OEIS Server: https://oeis.org/edit/global/133
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#6 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010
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Harry J. Smith, <a href="="/A063506/b063506.txt">Table of n, a(n) for n=1,...,148</a>
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| KEYWORD
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nonn,new
nonn
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#5 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010
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| LINKS
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Harry J. Smith, <a href="b063506.txt">Table of n, a(n) for n=1,...,148</a>
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| PROG
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(PARI) { for (n=1, 148, if (n>1, a=eulerphi(a)*numdiv(a), a=3); write("b063506.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 24 2009]
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| KEYWORD
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nonn,new
nonn
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