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A004768
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Binary expansion ends 001.
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5
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9, 17, 25, 33, 41, 49, 57, 65, 73, 81, 89, 97, 105, 113, 121, 129, 137, 145, 153, 161, 169, 177, 185, 193, 201, 209, 217, 225, 233, 241, 249, 257, 265, 273, 281, 289, 297, 305, 313, 321, 329, 337, 345, 353, 361, 369, 377, 385, 393, 401, 409, 417, 425, 433, 441, 449, 457, 465, 473, 481, 489
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OFFSET
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0,1
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COMMENTS
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Apart from initial term(s), dimension of the space of weight 2n cusp forms for Gamma_0( 28 ).
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LINKS
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FORMULA
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a(n) = 8*n + 9.
For n > 0: a(n) = A017077(n-1). (End)
a(n) = 2*a(n-1) - a(n-2); a(0)=9, a(1)=17. - Harvey P. Dale, May 10 2015
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MATHEMATICA
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Rest[FromDigits[#, 2]&/@(Join[#, {0, 0, 1}]&/@Tuples[{0, 1}, 7])] (* or *) LinearRecurrence[{2, -1}, {9, 17}, 100] (* Harvey P. Dale, May 10 2015 *)
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PROG
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(PARI) Vec((9 - x) / (1 - x)^2 + O(x^50)) \\ Colin Barker, Jul 04 2019
(Python)
def a(n): return 8*n + 9
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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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