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Search: id:A140538
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| A140538 |
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Greatest prime factor of 2*n^4+1. |
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+0
1
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| 3, 11, 163, 19, 139, 2593, 1601, 2731, 1193, 113, 227, 619, 577, 8537, 73, 43691, 55681, 209953, 307, 9697, 388963, 52057, 1091, 337, 260417, 304651, 3011, 4937, 471521, 1620001, 691, 5419, 32491, 46889, 90947, 25643, 11057, 15619, 7499, 7793
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n) = A006530(2n^4+1) = A076565(n^4). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 04 2008]
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EXAMPLE
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a(2)= 11 because 2*2^4+1 = 33 = 3*11, greatest prime factor is 11.
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CROSSREFS
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Sequence in context: A010682 A080987 A132561 this_sequence A006485 A003115 A053888
Adjacent sequences: A140535 A140536 A140537 this_sequence A140539 A140540 A140541
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KEYWORD
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easy,nonn
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AUTHOR
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Donald S. McDonald (MCDOnewt(AT)yahoo.co.nz), Jul 06 2008
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EXTENSIONS
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Extended from a(16) on, R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 04 2008
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