# The Number 15: Properties and Meanings

Prime Factors of**15**=3x5.

**15**is a Triangular Number.

**15**is a Rhombic Dodecahedral Number.

**15**is a Hexagonal Number.

7 can be Partitioned in

**15**ways.

**15**can be Partitioned in 176 ways.

**15**can be Partitioned 8 times with each term no larger than 2.

**15**can be Partitioned 27 times with each term no larger than 3.

**15**can be Partitioned 54 times with each term no larger than 4.

**15**can be Partitioned 84 times with each term no larger than 5.

**15**can be Partitioned 110 times with each term no larger than 6.

**15**can be Partitioned 131 times with each term no larger than 7.

**15**can be Partitioned 146 times with each term no larger than 8.

**15**can be Partitioned 157 times with each term no larger than 9.

**15**can be Partitioned 164 times with each term no larger than 10.

**15**can be Partitioned 169 times with each term no larger than 11.

**15**can be Partitioned 172 times with each term no larger than 12.

**15**can be Partitioned 174 times with each term no larger than 13.

**15**can be Partitioned 175 times with each term no larger than 14.

**15**is the smallest composite number n with the property that there is only one group of order n.

A 3 x 3 magic square has a constant of

**15**.

**15**is a Bell Number.

There are exactly

**15**supersingular primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 41, 47, 59, and 71. The supersingular primes are exactly the set of primes that divide the group order of the Monster group.Top of Form 1

The Chemical Element Phosphorus has an atomic number of

**15**.

**Jainism**

The following are the Virtues and activities of noble people:-- (l) fearing social censure; (2) helping those in distress; (3) gratitude; (4) respecting others and not disturbing their prayers and other spiritual activities; (5) discarding calumniation; (6) praising patience in adversity; (7) humbleness in prosperity; (8) speaking sweetly and agreeably to friends according to necessity; (9) abiding by one's word; (l0) over-coming impediments; (ll) planned expenditure; (12) insistence on doing noble things; (13) discarding improper actions; (14) discarding such evils as excessive sleep, sensual delights, passions and scandal-mongering; (15) caring for propriety etc. If you keep admiring such virtues you will acquire them. There effect will fall upon your mind. Your life must be brightened by these thirty five essential marganusari Virtues because afterwards if a person proceeds further and becomes a sadhu and if even after that the breaks anyone of these thirty five Virtues he will fall from the lofty level to a low level.

**15**Eunomia is a very large asteroid in the inner main asteroid belt.

Film:

**15**Minutes.

### The Year 15 AD

In the year**15**AD Valerius Gratus was appointed Prefect of Judaea.