- 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.