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.[1]

See also the Bhargava–Hanke 290 theorem.

Integers from 291 to 299

291

Main article: 291 (number)

292

Main article: 292 (number)

293

Main article: 293 (number)

294

Main article: 294 (number)

295

Main article: 295 (number)

296

Main article: 296 (number)

297

Main article: 297 (number)

298

Main article: 298 (number)

299

Main article: 299 (number)

References

  1. ^ "Sloane's A005282 : Mian-Chowla sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.