# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a094380 Showing 1-1 of 1 %I A094380 #5 Mar 30 2012 17:22:33 %S A094380 462,142,742,862,2170,2062,3502,2962,5278,5413,7282,8002,11302,11278, %T A094380 14722,13918,18778,21058,30178,30493,30622,34318,47338,31102,44902, %U A094380 43717 %N A094380 Greatest number having exactly n representations as ab+ac+bc with 1 <= a <= b <= c. %C A094380 Numbers up to 250,000 were checked. Note that the Mathematica program computes A094379, A094380 and A094381, but outputs only this sequence. %D A094380 See A025052 %e A094380 a(1) = 142 because 142 is the largest number with a unique representation: (a,b,c) = (1,10,12). %t A094380 cntMax=10; nSol=Table[{0, 0, 0}, {cntMax+1}]; Do[lim=Ceiling[(n-1)/2]; cnt=0; Do[If[n>a*b && Mod[n-a*b, a+b]==0 && Quotient[n-a*b, a+b]>=b, cnt++; If[cnt>cntMax, Break[]]], {a, 1, lim}, {b, a, lim}]; If[cnt<=cntMax, If[nSol[[cnt+1, 1]]==0, nSol[[cnt+1, 1]]=n]; nSol[[cnt+1, 2]]=n; nSol[[cnt+1, 3]]++;], {n, 10000}]; Table[nSol[[i, 2]], {i, cntMax+1}] %Y A094380 Cf. A025052 (n having no representations), A093670 (n having one representation), A094379, A094381. %K A094380 nonn %O A094380 0,1 %A A094380 _T. D. Noe_, Apr 28 2004 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE