In decimal, 15 contains the digits 1 and 5 and is the result of adding together the integers from 1 to 5 (1 + 2 + 3 + 4 + 5 = 15). The only other number with this property (in decimal) is 27.

Nov 21, 2025 · As the product of two sacred numbers (3 × 5), 15 naturally has religious significance. In ancient Nineveh the goddess Ishtar was served by 15 priests, and the city had …

The X-15 achieved several speed and altitude marks in the early 1960s, reaching the limit with outer space (the Kármán line) and obtaining information that would be used in the design of …

3 days ago · 15 Add to list Definitions of 15 noun the cardinal number that is the sum of fourteen and one synonyms: XV, fifteen

In this article, we'll explore 15 interesting and surprising facts about the number 15, from its role in math and science to its cultural significance and historical significance.

Number 15 is a Tetranacci number, a Bell number, a regular number (Hamming number) and a triangular number with n=5 and a hexagonal number with n=3. Number 15 is a deficient …

Explore the curious properties of number 15, an odd composite number composed of two distinct primes. Includes mathematical info, prime factorization, divisors, bases and much more! A …