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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 May 8 19:28 EDT 2021. Contains 343666 sequences. (Running on oeis4.)