290 (number)

Quality 0.50 · 2 views · Updated 2 months ago

title: "290 (number)" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["integers"] topic_path: "general/integers" source: "https://en.wikipedia.org/wiki/290_(number)" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::callout[type=note] This article covers the number 290. For the year, see 290. ::

290 (two hundred [and] ninety) is the natural number following 289 and preceding 291.

In mathematics

The product of three primes, 290 is a sphenic number, and the sum of four consecutive primes (67 + 71 + 73 + 79). The sum of the squares of the divisors of 17 is 290.

Not only is it a nontotient and a noncototient, it is also an untouchable number.

290 is the 16th member of the Mian–Chowla sequence; it can not be obtained as the sum of any two previous terms in the sequence.

See also the Bhargava–Hanke 290 theorem.

References

References

  1. {{Cite OEIS. A007304. sphenic numbers
  2. {{Cite OEIS. A005277. nontotients
  3. {{Cite OEIS. A005278. noncototient
  4. {{Cite OEIS. A005114. untouchable numbers
  5. "Sloane's A005282 : Mian-Chowla sequence". OEIS Foundation.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

integers