# Mathematical puzzles

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Mathematical aptitude tests frequently have sets of numbers where you are supposed to figure out a pattern or guess the next number. For example,

- (
**2, 4, 6, 8, 10**) is a list of even numbers corresponding to 2×n for n=1, 2, 3, …

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**1, 1, 2, 3, 5**) is the well-known Fibonacci series where two adjacent numbers are added to produce the next number.

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**2, 3, 5, 7, 11**) is a list of prime numbers.

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**1, 2, 4, 8, 16**) is an exponential series corresponding to 2^{n}for n=0, 1, 2, …

Can you figure out the special significance of the following sequence?

(**2, 6, 10, 15, 19**

he words “Numerology” and “special significance” in the statement of the problem should have given you a hint that this was not a simple mathematical problem.

The sequence (**2, 6, 10, 15, 19**) corresponds to **every fourth floor starting from 2** in the building where I live. As you can see in the picture of the elevator panel, the number 13 is skipped to avoid “bad luck”.

If you did not guess the answer, it is because numerology is not mathematics.

**Numerology**is defined as the study of the “occult meanings” of numbers and their supposed influence on human life. Almost every culture has superstitions and traditions about numbers that are reflected in their art, religion, folklore, and architectural designs. Numerology associates numbers with various attributes, e.g., lucky, unlucky, auspicious, or evil.**4**is considered unlucky by the Chinese and Japanese, because it sounds like the word “death”.**7**is considered lucky by most cultures.**13**is considered unlucky by most Western cultures.**666**is considered evil by some Christians because it is the number of the “beast” according to the Bible (Revelation 13:18).

Even if we don’t believe in the superstitions of numerology, we have to deal with the numerical traditions of our culture.

### Your Answer

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