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A164653
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a(1) = 1, for n>=2: a(n) = sum of two consecutive noncomposite numbers A008578.
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2
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1, 3, 5, 8, 12, 18, 24, 30, 36, 42, 52, 60, 68, 78, 84, 90, 100, 112, 120, 128, 138, 144, 152, 162, 172, 186, 198, 204, 210, 216, 222, 240, 258, 268, 276, 288, 300, 308, 320, 330, 340, 352, 360, 372, 384, 390, 396, 410, 434, 450, 456, 462, 472, 480, 492, 508
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OFFSET
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1,2
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COMMENTS
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Basically these are the sums of two successive primes. - N. J. A. Sloane, Nov 16 2018
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LINKS
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FORMULA
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a(n) = A076273(n-1) + 1 for n >= 2.
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MATHEMATICA
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ListConvolve[{1, 1}, Join[{0, 1}, Prime[Range[100]]]] (* Paolo Xausa, Nov 02 2023 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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