115 is the natural number following 114 and preceding 116. 115 is a heptagonal pyramidal number and a lucky number. Natural number can mean either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). Natural numbers have two main purposes: they can be used for counting (there are 3 apples on the table), or they can be used for ordering (this is... 114 (one hundred [and] fourteen) is the natural number following 113 and preceding 115. ... 116 is the natural number following 115 and preceding 117. ... A heptagonal pyramidal number is the sum of the first few heptagonal numbers. ... This article is about the formal mathematical concept defined by Stanislaw Ulam; a discussion of the more common meaning is also available. ...

One hundred fifteen is also: Alternative meaning: number of pitch classes in a set. ... Ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... This article is about the mathematical concept. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary or base-two numeral system is a system for representing numbers in which a radix of two is used; that is, each digit in a binary numeral may have either of two different values. ... In mathematics, hexadecimal or simply hex is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ...

• The atomic number of an element temporarily called ununpentium.
• The year AD 115 or 115 BC.