عدد الواحد المكرر
Sign in to saveIn recreational mathematics, a repunit is a number like 11, 111, or 1111 that contains only the digit 1 — a more specific type of repdigit. The term stands for "repeated unit" and was coined in 1966 by Albert H. Beiler in his book Recreations in the Theory of Numbers.
Key facts
- Integer sequence.name
- Repunit prime
- Integer sequence.terms_number
- 11
- Integer sequence.con_number
- Infinite
- Integer sequence.first_terms
- 11, 1111111111111111111, 11111111111111111111111
- Integer sequence.largest_known_term
- (108177207−1)/9
- Integer sequence.OEIS
- A004022
- Integer sequence.OEIS_name
- Primes of the form (10^n − 1)/9
via Wikipedia infobox