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 2021-01-26, 05:18 #1 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 23×89 Posts Alternating sequence Just so you know- An alternating sequence A(n) = (-1)^n Is in Online Encyclopedia of Integer Sequences See 033999 Good fun
 2021-01-26, 05:50 #2 Batalov     "Serge" Mar 2008 Phi(4,2^7658614+1)/2 22·2,347 Posts Edited your message for coherence. Don't expect it to happen every time. It's A033999, not A033998.
 2021-01-27, 03:41 #3 CRGreathouse     Aug 2006 176116 Posts I think that's the only pure, nontrivial alternating sequence in the OEIS at the moment. There are A062157, A105812, A117154, A165326, and A280560 which alternate after some finite prefix, and of course A000004 which alternates in a trivial sort of way.
 2021-01-27, 08:08 #4 MattcAnderson     "Matthew Anderson" Dec 2010 Oregon, USA 23·89 Posts Another interesting sequence is OEIS.org/A250001 It is about “How many ways can circles overlap?” Everyone is different. Also see a Numberphile video in YouTube Called “How many ways can circles overlap?” The sequence has 1, 3, 14, 173 in the beginning Cheers Matt
2021-01-27, 15:02   #5
Uncwilly
6809 > 6502

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Aug 2003
101×103 Posts

250616 Posts

Quote:
 Originally Posted by MattcAnderson Also see a Numberphile video in YouTube Called “How many ways can circles overlap?”
Was it too challenging for you to provide us with a link. The forum even has special mark-up for YT. Using it will provide for an embedded viewer.

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