Revision History for A132385
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing entries 1-10
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#13 by Bruno Berselli at Thu Jun 28 02:44:35 EDT 2018
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#12 by Robert Israel at Thu Jun 28 02:32:51 EDT 2018
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#11 by Robert Israel at Thu Jun 28 02:32:47 EDT 2018
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| KEYWORD
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easy,nonn,changed,look
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proposed
editing
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#10 by Robert Israel at Thu Jun 28 02:31:51 EDT 2018
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#9 by Robert Israel at Thu Jun 28 02:31:46 EDT 2018
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| COMMENTS
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If n is in A088232, a(n) = A000720(n-1) - A056170(n). - Robert Israel, Jun 28 2018
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| LINKS
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Robert Israel, <a href="/A132385/b132385.txt">Table of n, a(n) for n = 1..10000</a>
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| MAPLE
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f:= proc(n)
if numtheory:-phi(n) mod 3 = 0 then nops(select(isprime, {seq(i^3 mod n, i=0..n-1)}))
else numtheory:-pi(n-1) - nops(select(t -> t[2]>1, ifactors(n)[2]))
fi
end proc:
map(f, [$1..100]); # Robert Israel, Jun 28 2018
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| CROSSREFS
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Cf. A000040, A000578, A000720, A056170, A132213.
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| STATUS
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approved
editing
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#8 by Jon E. Schoenfield at Wed Sep 16 13:56:03 EDT 2015
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#7 by Jon E. Schoenfield at Wed Sep 16 13:56:01 EDT 2015
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| MATHEMATICA
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Table[Length[Select[Union[Table[Mod[i^3, n], {i, 0, n}], Table[Mod[i^3, n], {i, 0, n}]], PrimeQ[ # ] &]], {n, 1, 70}] - _}] (* _Stefan Steinerberger_, Nov 12 2007 *)
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| STATUS
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approved
editing
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#6 by Russ Cox at Fri Mar 30 18:49:46 EDT 2012
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| COMMENTS
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It seems that the size of a(n) as compared to its surrounding elements is dependent on whether or not n is in A088232. If n is in A088232 the sequence assumes "big" values, otherwise the values will be "small". - ". - _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, Nov 24 2007
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| MATHEMATICA
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Table[Length[Select[Union[Table[Mod[i^3, n], {i, 0, n}], Table[Mod[i^3, n], {i, 0, n}]], PrimeQ[ # ] &]], {n, 1, 70}] - }] - _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, Nov 12 2007
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| EXTENSIONS
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More terms from _Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), _, Nov 12 2007
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Discussion
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| Fri Mar 30
| 18:49
| OEIS Server: https://oeis.org/edit/global/238
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#5 by Russ Cox at Fri Mar 30 18:40:43 EDT 2012
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| AUTHOR
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_Jonathan Vos Post (jvospost3(AT)gmail.com), _, Nov 07 2007
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Discussion
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| Fri Mar 30
| 18:40
| OEIS Server: https://oeis.org/edit/global/228
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#4 by Russ Cox at Fri Mar 30 17:28:20 EDT 2012
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| EXTENSIONS
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Spelling/notation corrections by _Charles R Greathouse IV (charles.greathouse(AT)case.edu), _, Mar 18 2010
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Discussion
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| Fri Mar 30
| 17:28
| OEIS Server: https://oeis.org/edit/global/147
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