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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 1,5,15,35,69. (15559 is also the zip code of Schellsburg PA.) [Green]


  Submitted: 2013-03-28 17:20:36;   Last Modified: 2013-03-28 21:32:02.

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