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%I #11 Oct 03 2015 23:19:48
%S 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,
%T 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,
%U 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
%N a(n) = A024912(n) - A102342(n).
%C A139368(219) = -4.
%H <a href="/index/Pri#prime_races">Index entries for prime races</a>
%p From _R. J. Mathar_, Apr 25 2010: (Start)
%p 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:
%p 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:
%p A139368 := proc(n) A024912(n)-A102342(n) ; end proc: seq(A139368(n),n=1..120) ; (End)
%K sign
%O 1,2
%A _Juri-Stepan Gerasimov_, Jun 09 2008
%E More terms from _R. J. Mathar_, Apr 25 2010
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