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Search: id:A001007
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| A001007 |
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a(n) = ( Sum C(p,i); i=1,...,[ 2p/3 ] ) / p^2, where p = prime(n). |
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| 1, 2, 15, 42, 421, 1331, 15119, 618765, 2155578, 98032875, 1290154807, 4682196239, 63117678751, 3186252107917, 164886529617695, 616630679090258, 32763760653353135, 467443761039641135, 1768227793278781667
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