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A065397
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Primes which have no representation p + k*(k+1) / 2, with p prime and k > 0: A000040-Complement of A065396.
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4
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OFFSET
| 1,1
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COMMENTS
| Finite? (checked up to A000040(100000) = 1299709).
Next term >7000000 - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 23 2006
No other terms less than 2*10^9. - T. D. Noe (noe(AT)sspectra.com), Mar 26 2008
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MAPLE
| for n from 1 to 7000000 do if isprime(n) = true then foundp := false ; for k from 1 to n do if isprime(n-k*(k+1)/2) = true then foundp := true ; break ; elif n-k*(k+1)/2 < 2 then break ; fi ; od ; if foundp = false then print(n) ; fi ; fi ; od : - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 23 2006
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CROSSREFS
| A000040, A000217, A065377, A065396.
Sequence in context: A083810 A091687 A000892 * A046846 A111010 A089307
Adjacent sequences: A065394 A065395 A065396 * A065398 A065399 A065400
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KEYWORD
| more,nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 05 2001
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