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Search: id:A093153
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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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+0
3
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| 1, 1, 6, 9, 24, 146, 217, 445, 550, 5959, 14251, 63336, 118471, 183456, 951699, 3458333
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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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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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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Cf. A093151 A093152 A091295 A091098 A091099.
Adjacent sequences: A093150 A093151 A093152 this_sequence A093154 A093155 A093156
Sequence in context: A121592 A034718 A084431 this_sequence A115646 A115644 A024878
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KEYWORD
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easy,more,nonn
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Mar 24 2004
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