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3, 7, 19, 55, 139, 859, 2119, 112999, 333679, 10040119, 15363619, 548687179, 16632374359, 5733638351299, 14360489685499, 433098704482699, 44258681327079259, 5009018648920510999
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listen;
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internal format)
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OFFSET
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1,1
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COMMENTS
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Or, for i <> j, (a(i) + a(j))/2 are primes.
From a(5)=139 onward, all terms are 19 (mod 20).
Is sequence finite?
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LINKS
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CROSSREFS
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KEYWORD
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dead
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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