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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A098418 Number of prime triples (p,q,r) with p
 0, 0, 1, 2, 3, 3, 3, 2, 1, 0, 0, 1, 2, 2, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 1, 2, 3, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0, 1, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 2, 2, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS 0 <= a(n) <= 3; a(A098419(n))=0; a(A098420(n))>0; a(A098421(n))=1; a(A098422(n))=2; a(A098423(n))=3. LINKS Eric Weisstein's World of Mathematics, Prime Triplet EXAMPLE A000040(13)=41: A007529(7)=41, A098414(6)=41 and A098415(k)<>41 for all k, therefore a(13)=2. CROSSREFS Cf. A007529, A098414, A098415. Sequence in context: A062745 A140733 A143605 * A128080 A062187 A334485 Adjacent sequences:  A098415 A098416 A098417 * A098419 A098420 A098421 KEYWORD nonn AUTHOR Reinhard Zumkeller, Sep 07 2004 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 May 23 12:48 EDT 2022. Contains 353975 sequences. (Running on oeis4.)