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#20 by Bruno Berselli at Thu Apr 04 03:01:42 EDT 2019
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#19 by Michel Marcus at Thu Apr 04 00:31:55 EDT 2019
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#18 by Michel Marcus at Thu Apr 04 00:31:46 EDT 2019
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| LINKS
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Walter Nissen, <a href="http://upforthecount.com/math/abundance.html">Abundancy : Some Resources </a>
Walter Nissen, <a href="http://upforthecount.com/math/abundance.html">Abundancy : Some Resources </a>
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| PROG
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(PARI) isok(n) = sigma(n, -1) == 5/2; \\ Michel Marcus, Apr 04 2019
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| STATUS
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proposed
editing
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#17 by Robert Price at Wed Apr 03 20:02:43 EDT 2019
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#16 by Robert Price at Wed Apr 03 20:02:41 EDT 2019
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| MATHEMATICA
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Select[Range[100000], DivisorSigma[1, #]/# == 5/2 &] (* Robert Price, Apr 03 2019 *)
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| STATUS
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approved
editing
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#15 by N. J. A. Sloane at Tue Apr 19 01:07:36 EDT 2016
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| AUTHOR
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_Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), _, May 10 2008
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Discussion
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| Tue Apr 19
| 01:07
| OEIS Server: https://oeis.org/edit/global/2496
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#14 by Jon E. Schoenfield at Thu Mar 05 14:48:28 EST 2015
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#13 by Jon E. Schoenfield at Thu Mar 05 14:48:26 EST 2015
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| COMMENTS
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There are no other terms through 2^34. - . - _Walter Nissen _, Apr 17 2009
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| LINKS
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Walter Nissen, <a href="http://upforthecount.com">Home Page</a> (listed in lieu of email address)
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| EXTENSIONS
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Definition rewritten by _M. F. Hasler, _, May 10 2008
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| STATUS
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approved
editing
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#12 by T. D. Noe at Fri Aug 30 23:35:48 EDT 2013
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#11 by T. D. Noe at Fri Aug 30 23:35:44 EDT 2013
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| COMMENTS
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There are no other terms through 2^34. - Walter Nissen Apr 17 2009
No more terms below 10^12. - Jud McCranie, Aug 30 2013
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| EXTENSIONS
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First three terms confirmed by Ray Chandler, Sep 18 2008.
There are no other terms through 2^34. - Walter Nissen Apr 17 2009
No more terms below 10^12. - Jud McCranie, Aug 30 2013
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| STATUS
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approved
editing
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