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A076274
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2p-1 where p is 1 or a prime.
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29
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1, 3, 5, 9, 13, 21, 25, 33, 37, 45, 57, 61, 73, 81, 85, 93, 105, 117, 121, 133, 141, 145, 157, 165, 177, 193, 201, 205, 213, 217, 225, 253, 261, 273, 277, 297, 301, 313, 325, 333, 345, 357, 361, 381, 385, 393, 397, 421, 445, 453, 457, 465, 477, 481, 501, 513, 525, 537, 541
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n+1) - a(n) = 2*A075526(n) for all n.
G.f.: 1 + Sum_{ j>=1 } Sum_{ k>=1 } x^(pi(k/2)+j), where pi(k) is the prime counting function. - Benedict W. J. Irwin, Jun 13 2016
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MATHEMATICA
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PROG
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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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EXTENSIONS
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STATUS
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approved
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