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Search: id:A063477
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| 1, 1, 3, 4, 6, 15, 14, 32, 54, 72, 90, 403, 234, 420, 1116, 1536, 1598, 5400, 4332, 12096, 17724, 18000, 28658, 157248, 93062, 122148, 320760, 473760, 514230, 2142720, 1349244, 3391488, 5346540, 5708056, 11924808, 48211200, 24664200
(list; graph; listen)
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OFFSET
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1,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,380
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FORMULA
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a(n) = sigma(A000045(n)) = A000203(A000045(n)). [From Omar E. Pol (info(AT)polprimos.com), Dec 20 2008]
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MATHEMATICA
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lst={}; Do[AppendTo[lst, DivisorSigma[1, Fibonacci[n]]], {n, 6!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 20 2008]
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PROGRAM
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(PARI) j=[]; for(n=1, 50, j=concat(j, sigma(fibonacci(n)))); j
(Other) sage: [sigma(fibonacci(n), 1)for n in xrange(1, 38)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2009]
(PARI) { h=1; g=f=0; for (n=1, 380, f+=h; h=g; g=f; write("b063477.txt", n, " ", sigma(f)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 23 2009]
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CROSSREFS
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Cf. A000045.
Cf. A000203. [From Omar E. Pol (info(AT)polprimos.com), Dec 20 2008]
Sequence in context: A143100 A137820 A049892 this_sequence A129827 A122727 A089249
Adjacent sequences: A063474 A063475 A063476 this_sequence A063478 A063479 A063480
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 28 2001
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