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A133029
Divisors of 1729, the 2nd taxicab number (also called the Hardy-Ramanujan number).
5
1, 7, 13, 19, 91, 133, 247, 1729
OFFSET
1,2
COMMENTS
Note that 19 * 91 = 1729. For products of n-th prime and n-th prime written backwards, see A133019.
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.
Sequence in context: A070850 A060211 A355329 * A243962 A287304 A023984
KEYWORD
easy,fini,full,nonn
AUTHOR
Omar E. Pol, Oct 23 2007, Nov 07 2007
STATUS
approved