249 (number) explained
249 (two hundred [and] forty-nine) is the natural number following 248 and preceding 250.
Additionally, 249 is:
- a Blum integer.[1]
- a semiprime.
- palindromic in bases 82 (3382).
- a Harshad number in bases 3, 83, 84, 124, 167 and 247.
- the aliquot sum of any of these numbers: 375, 531, 1687, 4351, 7807, 12127, 14647 and 15151.
- part of the 3-aliquot tree. The aliquot sequence starting at 288 is: 288, 531, 249, 87, 33, 15, 9, 4, 3, 1, 0.
Notes and References
- Web site: Sloane's A016105 : Blum integers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-05-28.