

A239661


Divisors of 1089.


0




OFFSET

1,2


COMMENTS

Divisors of 33^2.
The sum of divisors of 1089 is equal to 1729, the HardyRamanujan number: A000203(1089) = A001235(1) = 1729.
The aliquot divisors of 1089 are also the powers of 3 written in base 26, see A004668.
Also 1089 is widely used in magic tricks because it can be produced from any two threedigit numbers (see Links section).


LINKS

Table of n, a(n) for n=1..9.
Wikipedia, 1089 (number)


EXAMPLE

Sigma(1089) = 1 + 3 + 9 + 11 + 33 + 99 + 121 + 363 + 1089 = 1729.


MATHEMATICA

Divisors[1089] (* Wesley Ivan Hurt, Jun 13 2014 *)


PROG

(PARI) divisors(1089) \\ Michel Marcus, Jun 14 2014


CROSSREFS

Cf. A000203, A001235, A004668.
Sequence in context: A027894 A249647 A004668 * A106305 A135365 A088877
Adjacent sequences: A239658 A239659 A239660 * A239662 A239663 A239664


KEYWORD

nonn,easy,fini,full


AUTHOR

Omar E. Pol, Jun 10 2014


STATUS

approved



