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A188161
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a(n) = 2*4^n + 3.
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15
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5, 11, 35, 131, 515, 2051, 8195, 32771, 131075, 524291, 2097155, 8388611, 33554435, 134217731, 536870915, 2147483651, 8589934595, 34359738371, 137438953475, 549755813891, 2199023255555, 8796093022211, 35184372088835, 140737488355331
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OFFSET
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0,1
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COMMENTS
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For n > 0, binary representation of a(n) is 1X11 where X is 2*n-1 zeros.
Number of conjugacy classes in Suzuki group Sz(2*4^n). - Eric M. Schmidt, Apr 18 2013
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LINKS
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FORMULA
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G.f. ( 5-14*x ) / ( (1-4*x)*(1-x) ). - R. J. Mathar, Apr 09 2011
a(n) = a(n-1)+12*a(n-2)-36 for n > 1, a(0)=5, a(1)=11. - Felix P. Muga II, Mar 19 2014
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EXAMPLE
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The first seven terms written in binary are 101, 1011, 100011, 10000011, 1000000011, 100000000011, and 10000000000011.
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MATHEMATICA
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PROG
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(Decimal BASIC)
FOR n=0 TO 1000
PRINT n; 2*4^n+3
NEXT n
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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