12815137

This number is a prime.

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If you replace each digit of 12815137 with the digit's square, you obtain a new prime and up to six primes doing this recursively: 12815137 -> 14641251949 -> 116361614251811681 -> 11369361361164251641136641 -> 11936819361936113616425136161193636161 -> 1181936641819361819361193613616425193613611819369361361. [Rivera]

Submitted: 2018-02-05 11:39:52;   Last Modified: 2018-07-04 05:58:23.
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