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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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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.
Starting with a(5)=139 on all terms are 19 mod 20.
Is sequence finite?
Is this a duplicate of A115760? [From R. J. Mathar, Jul 22 2010]. Yes, the terms are all 3-mod-4, just as A175533. Don Reble, Aug 17 2021.
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LINKS
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Table of n, a(n) for n=1..18.
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CROSSREFS
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Cf. A115760, A175532.
Sequence in context: A104522 A351633 A115760 * A183115 A183120 A100702
Adjacent sequences: A175530 A175531 A175532 * A175534 A175535 A175536
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KEYWORD
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dead
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AUTHOR
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Zak Seidov, Jun 12 2010
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EXTENSIONS
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More terms from Don Reble, Aug 17 2021
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STATUS
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approved
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