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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A081413 a(n) is the smallest p prime such that the largest prime divisor of the difference nextprime(a(n))-a(n) equals the n-th prime, prime(n). 2
 3, 23, 139, 113, 1129, 2477, 1327, 30593, 81463, 44293, 34061, 404597, 265621, 155921, 1100977, 1098847, 1349533, 3117299, 6958667, 10343761, 6034247, 49268581, 83751121, 39389989, 166726367, 107534587, 232423823, 253878403 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For n > 1, a(n) = A080082(n). - Zak Seidov, Jul 05 2013 LINKS FORMULA a(n) = min{ prime(j) : A006530(prime(j+1)-prime(j)) = prime(n) }. MATHEMATICA t=Table[0, {100}]; ma[n_]:=FactorInteger[n][[-1, 1]]; Do[s=ma[Prime[n+1]-Prime[n]]; If[s<101&&t[[PrimePi[s]]]==0, t[[PrimePi[s]]]=Prime[n]], {n, 2, 170000000}]; t CROSSREFS Cf. A001223, A006530, A080082, A000230, A000040. Sequence in context: A031970 A196881 A049164 * A179328 A255952 A089950 Adjacent sequences: A081410 A081411 A081412 * A081414 A081415 A081416 KEYWORD nonn AUTHOR Labos Elemer, Apr 02 2003 EXTENSIONS Three more terms added from A080082 by Zak Seidov, Jul 05 2013 Typo in Mathematica program fixed by Zak Seidov, Jul 06 2013 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 December 6 16:00 EST 2022. Contains 358644 sequences. (Running on oeis4.)