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Search: id:A138615
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| A138615 |
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Numbers of the form n^4 - m^2, where 0 < m < n^2. |
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+0
1
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| 7, 12, 15, 17, 31, 32, 45, 49, 56, 60, 65, 71, 72, 77, 80, 87, 96, 97, 112, 127, 135, 140, 141, 156, 161, 175, 184, 192, 199, 207, 220, 225, 231, 240, 241, 247, 252, 255, 264, 272, 285, 287, 301, 320, 335, 336, 337, 369, 375, 376, 391, 396, 400, 429, 449, 455
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Klaus Brockhaus, Table of n, a(n) for n=1..1000
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EXAMPLE
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7 is in the sequence because 2^4 - 3^2 = 7; 127 is in the sequence because 8^4 - 63^2 = 127.
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PROGRAM
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(PARI) {z=455; v=[]; n=2; while((p=n^4)-(q=n^2-1)^2<=z, m=q; while(m>0&&(a=p-m^2)<=z, v=concat(v, a); m--); n++); v=listsort(List(v), 1); for(j=1, #v, print1(v[j], ", "))} /* Klaus Brockhaus, May 31 2008 */
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CROSSREFS
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Sequence in context: A162194 A145310 A072834 this_sequence A071780 A063303 A091215
Adjacent sequences: A138612 A138613 A138614 this_sequence A138616 A138617 A138618
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KEYWORD
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nonn
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AUTHOR
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Garrett Webb (garrettwebb(AT)gmail.com), May 14 2008
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EXTENSIONS
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Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), May 31 2008
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