|
|
A180449
|
|
Primes of the form floor( (n*(sqrt(3)*n-1))/sqrt(2) ).
|
|
1
|
|
|
3, 167, 197, 577, 631, 809, 1009, 1231, 1741, 1931, 2029, 2339, 3533, 4079, 7207, 10301, 11933, 14741, 17551, 18743, 24943, 26003, 32027, 37813, 42239, 45013, 49831, 51827, 54377, 61843, 76369, 81973, 122849, 128339, 130729, 145531, 154097, 171047, 172883
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
Select[With[{c3=Sqrt[3], c2=Sqrt[2]}, Table[Floor[n (c3 n-1)/c2], {n, 500}]], PrimeQ] (* Harvey P. Dale, May 05 2011 *)
|
|
PROG
|
(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
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|