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A060325
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a(n) = n-th prime prime(n) subtracted from sum of all composites between prime(n) and prime(n-1).
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1
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-3, -1, -1, 16, -1, 28, -1, 40, 101, -1, 133, 76, -1, 88, 197, 221, -1, 253, 136, -1, 301, 160, 341, 554, 196, -1, 208, -1, 220, 1433, 256, 533, -1, 1147, -1, 613, 637, 328, 677, 701, -1, 1483, -1, 388, -1, 2044, 2164, 448, -1, 460, 941, -1, 1963, 1013, 1037, 1061, -1, 1093, 556, -1, 2299, 3593, 616, -1, 628, 3881
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OFFSET
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2,1
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LINKS
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FORMULA
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EXAMPLE
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a(2) = 0 - 3 = -3. a(5) = (8+9+10) - 11 = 16.
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MATHEMATICA
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a[n_] := Total@Range[Prime[n - 1] + 1, Prime[n] - 1] - Prime[n]; Array[a, 50, 2] (* James Spahlinger, Feb 20 2016 *)
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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EXTENSIONS
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Corrected and extended by Larry Reeves (larryr(AT)acm.org), Apr 20 2001
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STATUS
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approved
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