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A053609
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Primes of form x^2+1 where x = LCM(1,2,...,k) for some k.
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1
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OFFSET
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1,1
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COMMENTS
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The next term has k > 10^4, if it exists. - Amiram Eldar, Aug 23 2024
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LINKS
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FORMULA
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MATHEMATICA
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Select[FoldList[LCM, 1, Select[Range[100], PrimePowerQ]]^2 + 1, PrimeQ] (* Amiram Eldar, Aug 23 2024 *)
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CROSSREFS
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KEYWORD
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nonn,hard,changed
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AUTHOR
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STATUS
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approved
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