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A145120
Numbers X such that (X^2-19)/57 is a square.
1
38, 11438, 3454238, 1043168438, 315033414038, 95139047871038, 28731677423639438, 8676871442891239238, 2620386444075730610438, 791348029239427753113038, 238984484443863105709527038
OFFSET
1,1
FORMULA
a(n) = 302*a(n-1) - a(n-2).
From R. J. Mathar, Nov 27 2011: (Start)
G.f.: -38*x*(-1+x) / ( 1-302*x+x^2 ).
a(n) = 38*A145123(n). (End)
EXAMPLE
a(1)=38 because 38^2 = 57*25+19.
MATHEMATICA
LinearRecurrence[{302, -1}, {38, 11438}, 20] (* Harvey P. Dale, Jan 24 2013 *)
CROSSREFS
Sequence in context: A221354 A096558 A355589 * A183581 A030260 A145122
KEYWORD
easy,nonn
AUTHOR
Richard Choulet, Oct 02 2008
STATUS
approved