In recreational mathematics, a repdigit is a natural number composed of repeated instances of the same digit, most often in the decimal numeral system. Recreational mathematics is an umbrella term referring to Mathematical puzzles and Mathematical games. In Mathematics, a natural number (also called counting number) can mean either an element of the set (the positive Integers or an The decimal ( base ten or occasionally denary) Numeral system has ten as its base.
Examples are 11, 666, 4444, 77777, and 999999. In mathematics 666 is the natural number following 665 and preceding 667 The Feynman point is the sequence of six 9s which begins at the 762nd decimal place of π. All repdigits are palindromic numbers and are multiples of repunits. A palindromic number or numeral palindrome is a 'symmetrical' number like 16461 that remains the same when its digits are reversed In Recreational mathematics, a repunit is a Number like 11, 111, or 1111 that contains only the digit 1 One of the most famous repdigits is 666, referred to in Christian Eschatology as the number of the beast. In mathematics 666 is the natural number following 665 and preceding 667 A Christian is a person who adheres to Christianity, a monotheistic Religion centered on the life and teachings of Jesus of Nazareth Eschatology (from the Greek, Eschatos meaning "last" and -logy meaning "the study of" is a part of Theology The Number of the Beast is a concept from the Book of Revelation of the New Testament of the Christian Bible.
Repdigits are a representation of a number in base B represented by 
where 0 < x < B is the repeated digit and y is the number of repetitions. In mathematical numeral systems, the base or radix is usually the number of unique digits, including zero that a positional Numeral For example, the repdigit 77 in base 10 is 
.
The word repdigit is a portmanteau, formed from repeated digit.
See also
References
- Eric W. Weisstein, Repdigit at MathWorld. The Feynman point is the sequence of six 9s which begins at the 762nd decimal place of π. Eric W Weisstein (born March 18, 1969, in Bloomington Indiana) is an Encyclopedist who created and maintains MathWorld MathWorld is an online Mathematics reference work created and largely written by Eric W
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