# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a085809 Showing 1-1 of 1 %I A085809 #12 Dec 15 2017 17:36:29 %S A085809 1,2,4,6,10,34,186,422,760,1765,4112,4585,8112,8650,8861,75150,223993, %T A085809 327048,712605,1135940,23958638,42367759,47848742,54626559,121984495, %U A085809 157877985,413509327,798321315,983679985,1277946119,2403158480 %N A085809 Indices of semiprimes where largest gap occurs. Or, positions of records in A065516. %C A085809 A215231(n) = A065516(a(n)). - _Reinhard Zumkeller_, Mar 23 2014 %o A085809 (PARI) {sgr(m)=local(a,b,rec,c); c=0; a=0; b=4; rec=0; for(n=5,m,if(bigomega(n)==2,c++; a=n; if(a-b>rec,rec=a-b; print1(c","); b=a,b=a; )))} %o A085809 (Haskell) %o A085809 a085809 n = a085809_list !! (n-1) %o A085809 -- See A215231 for definition of a085809_list. %o A085809 -- _Reinhard Zumkeller_, Mar 23 2014 %Y A085809 Cf. A239674. %K A085809 nonn %O A085809 1,2 %A A085809 _Jason Earls_, Jul 24 2003 %E A085809 a(19)-a(26) from _Donovan Johnson_, Jan 28 2009 %E A085809 a(27)-a(31) from _Donovan Johnson_, Apr 14 2010 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE