A226074 Numbers k such that k^2+1 is a triangular number and k^2+2 is a prime number.

0, 3, 105, 4116315, 9721683943673162520781155, 35285058531373239343849920668944097883186271103498415

Offset

1,2

Comments

a(7) has 191 decimal digits: 222247847...170444715.

Corresponding primes and indices of triangular numbers: A226072 and A226073.

Subsequence of A106328. - Max Alekseyev, Jan 30 2014

Links

Table of n, a(n) for n=1..6.

Crossrefs

Cf. A226069-A226073.

Sequence in context: A226236 A074072 A352656 * A037115 A343214 A234636

Adjacent sequences: A226071 A226072 A226073 * A226075 A226076 A226077

Keyword

nonn

Author

Alex Ratushnyak, May 25 2013

Status

approved