# 46 arithmetic/arithmetic.progression.p

## Description

This article is from the Puzzles FAQ,
by Chris Cole chris@questrel.questrel.com and Matthew Daly
mwdaly@pobox.com with numerous contributions by others.

# 46 arithmetic/arithmetic.progression.p

Is there an arithmetic progression of 20 or more primes?

arithmetic/arithmetic.progression.s

There is an arithmetic progression of 21 primes:

142072321123 + 1419763024680 i, 0 <= i < 21.

It was discovered on 30 November 1990, by programs running in the background

on a network of Sun 3 workstations in the Department of Computer Science,

University of Queensland, Australia.

See: Andrew Moran and Paul Pritchard, The design of a background job

on a local area network, Procs. 14th Australian Computer Science Conference,

1991, to appear.

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