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A129446
Primes p such that p^2 is a centered triangular number; or primes in A129445.
2
2, 19, 79, 1861, 7741, 1647522841025041
OFFSET
1,1
COMMENTS
The next terms are too large to include, see the b-file.
LINKS
Alexander Adamchuk, Apr 26 2007, Table of n, a(n) for n = 1..9
MATHEMATICA
Do[ f = 3n(n-1)/2 + 1; If[ PrimeQ[ Sqrt[f] ], Print[ Sqrt[f] ] ], {n, 1, 150000} ]
CROSSREFS
Cf. A005448 (centered triangular numbers).
Cf. A129444 (numbers k such that centered triangular number A005448(k) = 3*k*(k-1)/2 + 1 is a perfect square).
Cf. A129445 (numbers k > 0 such that k^2 is a centered triangular number).
Sequence in context: A317274 A226019 A057326 * A240280 A327820 A331898
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Apr 15 2007, Apr 26 2007
STATUS
approved