Definition of pseudoprime in US English:

pseudoprime

noun

Mathematics
  • Any integer p for which a p − a is a multiple of p for a given positive integer a (the base), or (in full "absolute pseudoprime") for all positive integers, or for all positive integers where a and p are relatively prime.

adjective

Mathematics
  • Designating such a number.

Origin

1940s; earliest use found in American Mathematical Monthly.