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 2010-02-16, 20:45 #1 davar55     May 2004 New York City 10000100010112 Posts Help Find a Sequence? I'm trying to find a certain sequence, so far without success. I don't want to paste pingpong balls together, especially since this obvious sequence must have already been computed or counted. Help, please? The sequence begins with 1,13,?,?,? and gives the number of identical spheres in a most tight packing around the previous smaller packing, starting with one sphere.
 2010-02-16, 21:07 #2 Mini-Geek Account Deleted     "Tim Sorbera" Aug 2006 San Antonio, TX USA 102578 Posts
 2010-02-19, 16:54 #3 davar55     May 2004 New York City 108B16 Posts Thank you. The second sequence you found, A005902, that begins with 1, 13, 55, 147, 309, 561, 923, 1415, is what I was looking for. I'm surprised I missed it when I searched, but I had expected the third term to be smaller.

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