# 15559

This number is a prime.

The digits of the prime 15559 appear as the final digits of
the numbers in the sequence of
centered tetrahedral numbers. The
pattern 1-5-5-5-9 repeats for each successive group of 5
consecutive numbers in the sequence. The first five numbers
in the sequence are
**1**,**5**,1**5**,3**5**,6**9**. (15559 is also the ZIP Code of Schellsburg PA.) [Green]

(There are 2 curios for this number that have not yet been approved by an editor.)

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