arithmetic progression 
(also arithmetic series)
noun
1A sequence of numbers in which each differs from the preceding one by a constant quantity (e.g. 1, 2, 3, 4, etc.; 9, 7, 5, 3, etc.).Dutch mathematician Bartel L. van der Waerden was for one of the first to identify such a pattern among integers - one that involves arithmetic progressions in sets of numbers....
- The following year he published An elementary proof of the prime number theorem for arithmetic progressions.
- In one step toward elucidating certain primal mysteries, two mathematicians have now apparently proved that the population of primes contains an infinite collection of arithmetic progressions.
1.1 [mass noun] The relation between numbers in an arithmetic progression: the numbers are in arithmetic progression...
- Dubner, Zimmermann, and Forbes are now looking for help to find a sequence of nine consecutive primes in arithmetic progression.
- In this instance, the integers 6, 9, 1 constitute a three-term rainbow arithmetic progression with a common difference of 3.
- A theorem of Peter Gustav Lejeune Dirichlet on primes in arithmetic progression guarantees that all the other notes are heard infinitely often when one plays all the primes.