|
Search: id:A065397
|
|
|
| A065397 |
|
Primes which have no representation p + k*(k+1) / 2, with p prime and k > 0: A000040-Complement of A065396. |
|
+0
5
|
| |
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
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
|
|
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
|
|
CROSSREFS
|
A000040, A000217, A065377, A065396.
Sequence in context: A083810 A091687 A000892 this_sequence A046846 A111010 A089307
Adjacent sequences: A065394 A065395 A065396 this_sequence A065398 A065399 A065400
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 05 2001
|
|
|
Search completed in 0.002 seconds
|
