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Search: id:A124865
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| A124865 |
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Numbers of the form p^2-q^2, p, q primes, p>q. |
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+0
3
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| 5, 16, 21, 24, 40, 45, 48, 72, 96, 112, 117, 120, 144, 160, 165, 168, 192, 240, 264, 280, 285, 288, 312, 336, 352, 357, 360, 408, 432, 480, 504, 520, 525, 528, 552, 600, 648, 672, 720, 768, 792, 816, 832, 837, 840, 888, 912, 936, 952, 957, 960, 1008, 1032, 1080
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The only prime term is a(1) = 5. All odd terms are of the form p^2-4. All even terms are divisible by 8. Numbers of the form (p^2-q^2)/8 (p, q odd primes, p>q) are listed in A124866(n) = {2,3,5,6,9,12,14,15,18,20,21,24,30,33,35,36,39,42,44,45,51,54,60,63,65,66,69, 75,81,84,90,96,99,...}.
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CROSSREFS
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Cf. A045636 Numbers of the form p^2+q^2, p, q primes. Cf. A124866 Numbers of the form (p^2-q^2)/8, p, q odd primes, p>q.
Sequence in context: A095872 A063612 A057281 this_sequence A090781 A077469 A022140
Adjacent sequences: A124862 A124863 A124864 this_sequence A124866 A124867 A124868
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 10 2006
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