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%I #14 Jul 14 2021 01:55:13
%S 13,136101521
%N Primes that are the concatenation of the first k triangular numbers for some k.
%C Next term, if it exists, would be very large, as there are no other primes of this form up to at least index 1600.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a>
%Y Cf. A078795.
%K nonn,more,bref,base
%O 1,1
%A _Eric W. Weisstein_, Mar 25 2009
%E Name clarified by _Jon E. Schoenfield_, Jul 13 2021