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A093153
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Difference between counts of odd composites in A093151 and A093152 [Count (1 mod 4) - count (3 mod 4)].
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3
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0, 1, 6, 9, 24, 146, 217, 445, 550, 5959, 14251, 63336, 118471, 183456, 951699, 3458333, 6284059, 2581690, 80743227, 259753424
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OFFSET
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1,3
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COMMENTS
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In A091295 the counts are 1 higher. I computed the differences through 10^8 and the rest by extrapolating from A091098 and A091099. In the ranges given, the counts of odd composites less than 10^n are higher 1 mod 4 than 3 mod 4. They are exactly opposite for the primes less than 10^n where 3 mod 4 is higher.
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LINKS
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FORMULA
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Subtract count of odd composites 3 mod 4 less than 10^n from those 1 mod 4
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EXAMPLE
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Below 10^3 there are 169 odd composites 1 mod 4 and 163 odd composites 3 mod 4, so a(3)=169-163=6
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CROSSREFS
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KEYWORD
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more,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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