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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A005018 Divisors of 20: a finite sequence associated with the Lie algebra A_4. 1 1, 2, 4, 5, 10, 20 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 REFERENCES E. B. Dynkin, Semisimple subalgebras of semisimple Lie algebras, Am. Math. Soc. Translations, Series 2, Vol. 6, 1957, pp. 111-244, esp. p. 211. LINKS Table of n, a(n) for n=1..6. Index entries for sequences related to divisors of numbers FORMULA a(n) = A161706(n-1). - Reinhard Zumkeller, Jun 21 2009 PROG (Sage) divisors(20); # Zerinvary Lajos, Jun 13 2009 (PARI) divisors(20) CROSSREFS Sequence in context: A240100 A326156 A000675 * A249399 A118551 A161706 Adjacent sequences: A005015 A005016 A005017 * A005019 A005020 A005021 KEYWORD nonn,fini,full,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified August 29 18:55 EDT 2024. Contains 375518 sequences. (Running on oeis4.)