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Search: id:A005018
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| A005018 |
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Divisors of 20. Also a finite sequence associated with the Lie algebra A_4. |
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+0
2
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OFFSET
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1,2
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REFERENCES
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E. B. Dynkin, Semisimple subalgebras of semisimple Lie algebras, Am. Math. Soc. Translations, Series 2, Vol. 6, 1957, pp. 111-244, esp. p. 211.
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FORMULA
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a(n) = A161706(n-1). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 21 2009]
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PROGRAM
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(Other) sage: divisors(20); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 13 2009]
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CROSSREFS
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Sequence in context: A133040 A018424 A000675 this_sequence A118551 A161706 A128401
Adjacent sequences: A005015 A005016 A005017 this_sequence A005019 A005020 A005021
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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