The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A065397 Primes which have no representation p + k*(k+1) / 2, with p prime and k > 0: A000040-Complement of A065396. 5
 2, 7, 61, 211 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Finite? (Checked up to A000040(100000) = 1299709.) Next term > 7000000. - R. J. Mathar, Apr 23 2006 No other terms less than 2*10^9. - T. D. Noe, Mar 26 2008 LINKS Table of n, a(n) for n=1..4. 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, Apr 23 2006 CROSSREFS Cf. A000040, A000217, A065377, A065396. Sequence in context: A091687 A000892 A211875 * A255904 A046846 A111010 Adjacent sequences: A065394 A065395 A065396 * A065398 A065399 A065400 KEYWORD more,nonn AUTHOR Reinhard Zumkeller, Nov 05 2001 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 23 18:37 EDT 2024. Contains 373653 sequences. (Running on oeis4.)