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5, 25, 35, 55, 65, 85, 95, 115, 125, 145, 155, 175, 185, 205, 215, 235, 245, 265, 275, 295, 305, 325, 335, 355, 365, 385, 395, 415, 425, 445, 455, 475, 485, 505, 515, 535, 545, 565, 575, 595, 605, 625, 635, 655, 665, 685, 695, 715, 725, 745, 755, 775, 785
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refs;
listen;
history;
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OFFSET
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1,1
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COMMENTS
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Third row of A083140.
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LINKS
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Table of n, a(n) for n=1..53.
Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
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FORMULA
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GCD( 5k, 6) =1.
a(n)=5*A007310(n) [From Adriano Caroli, Oct 03 2010]
a(n)=5*(-3+(-1)^n+6*n)/2. a(n)=a(n-1)+a(n-2)-a(n-3). G.f.: 5*x*(x^2+4*x+1) / ((x-1)^2*(x+1)). [Colin Barker, Feb 24 2013]
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MATHEMATICA
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5Select[ Range[160], GCD[ #, 2*3] == 1 & ]
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CROSSREFS
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Cf. A083140, A063149, A007310.
Sequence in context: A018639 A029475 A070391 * A070390 A018724 A070389
Adjacent sequences: A084964 A084965 A084966 * A084968 A084969 A084970
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KEYWORD
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nonn,easy
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AUTHOR
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Robert G. Wilson v, Jun 15 2003
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STATUS
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approved
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