repunit

See also: repunît

English

Etymology

Blend of rep(eated) +‎ unit.

Noun

repunit (plural repunits)

1. A repdigit consisting only of one or more occurrences of the digit 1.

   11, 111, and 1,111 are repunits.

   • 1991, Paulo Ribenboim, The Little Book of Big Primes‎^[1], page 172:

     The only known prime repunits are R2, R19, R23, and more recently R317 (discovered by Williams in 1978) and R1031 (discovered by Williams & Dubner in 1986). Moreover, Dubner has determined that for every other prime p less than 10000, the repunit Rp is composite.

Hypernyms

• repdigit

Anagrams

• reinput

French

Pronunciation

• IPA^(key): /ʁə.py.ni/

Verb

repunit

1. inflection of repunir:
   1. third-person singular present indicative
   2. third-person singular past historic