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# 1122514137211631432881

This number is a prime.

11 2251413721 1631432881

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The concatenation of the first 4 square triangular numbers
with triangular number indexes - squares (1, 1225, 1413721
and 1631432881) is emirp. If we add to these numbers 36
(the second square triangular number) raised respectively
to the 1st, 6th, 5th and 6th power (the first 4 digits of
the end-digits sequence of the square triangular numbers),
we yield four more primes with concatenation - yet another
prime. If we add to the initial 4 numbers 1656 (note that
it is 81^2 reversed) raised to the power respectively 1, 2,
3 and 4, we yield primes too. [Petrov]
Submitted: 2019-04-19 03:13:17; Last Modified: 2019-04-19 06:46:15.

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell