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A090813
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a(n)=3*(3^prime(n)-1)*B(2*prime(n)) where prime(n)=n-th prime and B(k) denotes the k-th Bernoulli number.
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0
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55, 7651, 3290729563, 6818200140583, 166441513807473717727, 1702709510836284027532747, 597359613401618666812910561358019, 49136798858325589887577115786547403314116681479
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