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%I #10 Jan 16 2023 21:41:12
%S 0,3,105,4116315,9721683943673162520781155,
%T 35285058531373239343849920668944097883186271103498415
%N Numbers k such that k^2+1 is a triangular number and k^2+2 is a prime number.
%C a(7) has 191 decimal digits: 222247847...170444715.
%C Corresponding primes and indices of triangular numbers: A226072 and A226073.
%C Subsequence of A106328. - _Max Alekseyev_, Jan 30 2014
%Y Cf. A226069-A226073.
%K nonn
%O 1,2
%A _Alex Ratushnyak_, May 25 2013