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A182512
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a(n) = (16^n - 1)/5.
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7
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0, 3, 51, 819, 13107, 209715, 3355443, 53687091, 858993459, 13743895347, 219902325555, 3518437208883, 56294995342131, 900719925474099, 14411518807585587, 230584300921369395, 3689348814741910323, 59029581035870565171, 944473296573929042739
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OFFSET
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0,2
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COMMENTS
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Even bisection of A015521 and also A112627. All of the terms are divisible by 3, even terms by 17.
These are binary numbers 11, 110011, 1100110011, ... - Jamie Simpson, Oct 28 2022
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LINKS
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FORMULA
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a(n) = 16*a(n-1) + 3 where a(0)=0.
a(n) = A112627(2n) for n >= 1; a(0)=0.
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MAPLE
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MATHEMATICA
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LinearRecurrence[{17, -16}, {0, 3}, 20] (* Harvey P. Dale, Aug 07 2019 *)
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PROG
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(Magma)[(1/5)*2^(4*i) -(1/5): i in [0..30]];
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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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