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A145011
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First differences of A007775.
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0
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6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Terms of the simple continued fraction of 3836/[sqrt(19822530)-3836]. [From Paolo P. Lava (paoloplava(AT)gmail.com), Aug 05 2009]
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FORMULA
| Period 8: repeat 6,4,2,4,2,4,6,2.
a(n)=(1/112)*{-41*(n mod 8)+71*[(n+1) mod 8]-13*[(n+2) mod 8]-13*[(n+3) mod 8]+43*[(n+4) mod 8]-13*[(n+5) mod 8]+43*[(n+6) mod 8]+43*[(n+7) mod 8]}, with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Aug 28 2009]
a(n)= 2*((abs(abs((n mod 8) - 3) - 1) mod 3) + 1), with n >= 0 [From Pieter Stadhouders (pieter.stadhouders(AT)home.nl), Mar 09 2010]
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MATHEMATICA
| Differences[Select[Range[400], GCD[#, 30]==1&]] (* From Harvey P. Dale, Dec 07 2011 *)
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CROSSREFS
| Sequence in context: A114062 A125214 A028975 * A173625 A086036 A019849
Adjacent sequences: A145008 A145009 A145010 * A145012 A145013 A145014
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KEYWORD
| nonn
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AUTHOR
| Ki Punches (ki(AT)kispy.net), Feb 25 2009
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EXTENSIONS
| Edited by Omar E. Pol (info(AT)polprimos.com), Mar 02 2009
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