Redmond-Sun conjecture


Conjecture. (Stephen Redmond & Zhi-Wei Sun) Given positive integers x and y, and exponentsMathworldPlanetmath a and b (with all these numbers being greater than 1), if xayb, then between xa and yb there are always primes, with only the following ten exceptions:

  1. 1.

    There are no primes between 23 and 32.

  2. 2.

    There are no primes between 52 and 33.

  3. 3.

    There are no primes between 25 and 62.

  4. 4.

    There are no primes between 112 and 53.

  5. 5.

    There are no primes between 37 and 133.

  6. 6.

    There are no primes between 55 and 562.

  7. 7.

    There are no primes between 1812 and 215.

  8. 8.

    There are no primes between 433 and 2822.

  9. 9.

    There are no primes between 463 and 3122.

  10. 10.

    There are no primes between 224342 and 555.

See A116086 in Sloane’s OEIS for a listing of the perfect powersMathworldPlanetmath beginning primeless ranges before the next perfect power. As of 2007, no further counterexamples have been found past 555.

Title Redmond-Sun conjecture
Canonical name RedmondSunConjecture
Date of creation 2013-03-22 17:26:50
Last modified on 2013-03-22 17:26:50
Owner PrimeFan (13766)
Last modified by PrimeFan (13766)
Numerical id 7
Author PrimeFan (13766)
Entry type Conjecture
Classification msc 11N05