A133029 - OEIS

A133029

Divisors of 1729, the 2nd taxicab number (also called the Hardy-Ramanujan number).

1, 7, 13, 19, 91, 133, 247, 1729

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Note that 19 * 91 = 1729. For products of n-th prime and n-th prime written backwards, see A133019.

LINKS

EXAMPLE

7 * 247 = 1729 and 13 * 133 = 1729.

MATHEMATICA

Divisors[1729] (* Alonso del Arte, Oct 11 2019 *)

PROG

(PARI) divisors(1729) \\ Charles R Greathouse IV, Jun 21 2017

CROSSREFS

Cf. A000005, A018487. Taxicab numbers: A011541.

KEYWORD

easy,fini,full,nonn

AUTHOR

Omar E. Pol, Oct 23 2007, Nov 07 2007

STATUS

approved