Reply to comment

mysterie number

There are two four digit numbers that satisfy condition 1.
1458: sum digits is 18 and 18 ∙ 81 = 1458
1729: sum digits is 19 and 19 ∙ 91 = 1729.

But 1458 does not satisfy condition 2, so we delete it.
1729 does satisfy condition 2: 9271 = 73 ∙ 127 and
(73^2 + 127^2) / 2 = 10729.

Reply

  • Web page addresses and e-mail addresses turn into links automatically.
  • Allowed HTML tags: <a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.

More information about formatting options

To prevent automated spam submissions leave this field empty.
By submitting this form, you accept the Mollom privacy policy.