This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A180449 #17 Jul 03 2025 14:51:37
%S A180449 3,167,197,577,631,809,1009,1231,1741,1931,2029,2339,3533,4079,7207,
%T A180449 10301,11933,14741,17551,18743,24943,26003,32027,37813,42239,45013,
%U A180449 49831,51827,54377,61843,76369,81973,122849,128339,130729,145531,154097,171047,172883
%N A180449 Primes of the form floor( (k*(sqrt(3)*k-1))/sqrt(2) ).
%H A180449 Charles R Greathouse IV, <a href="/A180449/b180449.txt">Table of n, a(n) for n = 1..10000</a>
%t A180449 Select[With[{c3=Sqrt[3],c2=Sqrt[2]},Table[Floor[n (c3 n-1)/c2], {n,500}]],PrimeQ] (* _Harvey P. Dale_, May 05 2011 *)
%o A180449 (PARI) for(n=1, 1e4, if(ispseudoprime(t=floor((n*(sqrt(3)*n-1))/sqrt(2))), print1(t", "))); v \\ _Charles R Greathouse IV_, Feb 18 2011
%K A180449 easy,nonn
%O A180449 1,1
%A A180449 _William A. Tedeschi_, Sep 07 2010, typo in definition corrected Sep 09 2010