The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A288102 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A288102

Number of solutions to x^7 + y^7 = z^7 mod n.
(history; published version)

#15 by Joerg Arndt at Wed Jul 18 02:19:19 EDT 2018

STATUS

reviewed

approved

#14 by Michel Marcus at Wed Jul 18 01:37:33 EDT 2018

STATUS

proposed

reviewed

#13 by Andrew Howroyd at Tue Jul 17 23:48:10 EDT 2018

STATUS

editing

proposed

#12 by Andrew Howroyd at Tue Jul 17 23:02:13 EDT 2018

KEYWORD

nonn,mult,changed

#11 by Andrew Howroyd at Tue Jul 17 23:01:31 EDT 2018

PROG

(PARI) a(n)={my(p=Mod(sum(i=0, n-1, x^lift(Mod(i, n)^7)), 1-x^n)); polcoeff(lift(p^3), 0)} \\ Andrew Howroyd, Jul 17 2018

#10 by Andrew Howroyd at Tue Jul 17 23:01:12 EDT 2018

COMMENTS

Equivalently, the number of solutions to x^7 + y^7 + z^7 == 0 (mod n). - Andrew Howroyd, Jul 17 2018

PROG

a(n)={my(p=Mod(sum(i=0, n-1, x^lift(Mod(i, n)^7)), 1-x^n)); polcoeff(lift(p^3), 0)} \\ Andrew Howroyd, Jul 17 2018

EXTENSIONS

Keyword:mult added by Andrew Howroyd, Jul 17 2018

STATUS

approved

editing

#9 by Bruno Berselli at Mon Jun 05 11:20:43 EDT 2017

STATUS

proposed

approved

#8 by Seiichi Manyama at Mon Jun 05 11:18:00 EDT 2017

STATUS

editing

proposed

#7 by Seiichi Manyama at Mon Jun 05 11:17:53 EDT 2017

LINKS

Seiichi Manyama, <a href="/A288102/b288102.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#6 by Bruno Berselli at Mon Jun 05 10:48:44 EDT 2017

STATUS

reviewed

approved