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 A139368 a(n) = A024912(n) - A102342(n). 1
 1, 2, 1, 2, 1, 1, 3, 3, 5, 4, 5, 5, 3, 2, 1, 1, 2, 7, 8, 7, 7, 4, 6, 6, 3, 5, 6, 6, 6, 8, 6, 8, 4, 6, 4, 9, 9, 9, 10, 11, 12, 10, 11, 10, 12, 16, 9, 9, 9, 5, 8, 7, 5, 7, 8, 13, 11, 6, 7, 5, 1, 1, 2, 10, 11, 15, 15, 14, 12, 10, 12, 9, 9, 14, 18, 13, 14, 13, 14, 14, 12, 8, 8, 8, 7, 8, 4, 6, 7, 11, 10 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A139368(219) = -4. LINKS MAPLE From R. J. Mathar, Apr 25 2010: (Start) A102342 := proc(n) option remember; if n = 1 then 0; else for a from procname(n-1)+1 do if isprime(10*a+7) then return a; end if; end do: end if; end proc: A024912 := proc(n) option remember; if n = 1 then 1; else for a from procname(n-1)+1 do if isprime(10*a+1) then return a; end if; end do: end if; end proc: A139368 := proc(n) A024912(n)-A102342(n) ; end proc: seq(A139368(n), n=1..120) ; (End) CROSSREFS Sequence in context: A224076 A137278 A205810 * A266506 A134303 A078997 Adjacent sequences:  A139365 A139366 A139367 * A139369 A139370 A139371 KEYWORD sign AUTHOR Juri-Stepan Gerasimov, Jun 09 2008 EXTENSIONS More terms from R. J. Mathar, Apr 25 2010 STATUS approved

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Last modified August 20 10:05 EDT 2019. Contains 326149 sequences. (Running on oeis4.)