unprimeable

English

Alternative forms

• unprimable

Adjective

unprimeable (not comparable)

1. (arithmetic) That cannot be turned into a prime number by changing just one of its digits to any other digit.
   • 2007 May 26, “Episode #200”, in Game Show Newsnet:

     In the year 200 Diophantus, noted Greek mathematician was born. 200 million is approximately 2/3 of the total population of this country we call home. 200 is also the smallest base 10 unprimeable number.

   • 2015 June 29, “Brain-O Quiz Answers”, in Mathematical Mystery Tour:

     6,292,015 is a composite, Duffinian, odd, semiprime, square-free and unprimeable number.

   • 2015 November 1, Adam Spencer, Adam Spencer's World of Numbers, Xoum Publishing, page 200:

     200 is the smallest unprimable number

   • 2019, Julia Collins, Numbers in Minutes:

     There are infinitely many unprimeable numbers, although the first unprimeable number ending in an odd number is not until 212159.

2. That cannot be primed.
   • 1989, Cyma K. Van Petten, Context Effects in Word Recognition, page 215:

     In this count, the Syntactic sentences actually had more "unprimeable" words than the Random, 86 versus 74.

   • 1999, “C.A.6(Ky.) 1996”, in West's Federal Practice Digest, volume 77, number 4, West Publishing Company:

     General purpose of materialman's lien statutes is to give contractors a lien that is unprimeable by subsequently entered consensual mortgage agreements.