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A037040
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Number of odd nonprimes < (2n+1)^2.
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2
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0, 1, 4, 10, 19, 31, 46, 65, 84, 109, 136, 166, 199, 236, 275, 319, 364, 413, 466, 521, 578, 642, 707, 776, 844, 923, 996, 1079, 1168, 1254, 1342, 1436, 1535, 1636, 1740, 1846, 1960, 2074, 2186, 2310, 2434, 2559, 2690, 2825, 2961, 3103, 3248, 3392, 3542
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OFFSET
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0,3
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REFERENCES
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C. R. Christofferson, 15219 Wickmere, Houston, TX 77062, (281) 486-4139 (unpublished notes)
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LINKS
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EXAMPLE
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The odd nonprimes < 25 are 1,9,15,21, so a(2)=4.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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C.R.Christofferson (magpie56(AT)aol.com)
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STATUS
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approved
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