来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a291928 Showing 1-1 of 1 %I A291928 %S A291928 1,4,8,12,16,24,36,48,72,96,120,144,216,240,288,360,480,576,720,1080, %T A291928 1440,2160,2520,2880,3360,3600,4320,5040,7200,7560,8640,10080,15120, %U A291928 20160,25200,30240,40320,45360,50400,60480,75600,90720,100800,110880,120960 %N A291928 Positions of records in A218320. %C A291928 Distinct from A033833; first term not in A033833 is a(24) = 2520. 当n增加时,似乎有越来越多的术语A(n)不在A0338 33中。% %C A29 1928 A29 1834(13)=192是最小的项,而不是在A(N).C%A191928的A02548 7。n,a(n)n=1…160的表%t A291928 f[n_, i_, t_] := f[n, i, t] = If[n == 1, 1, If[t == 1, Boole[n <= i], Sum[f[n/d, d, t - 1], {d, Select[Divisors@ n, # <= i &]}]]]; With[{s = Array[f[#, #, 4] &, 10^5]}, Map[FirstPosition[s, #][[1]] &, Union@ FoldList[Max, s]]] (* _Michael De Vlieger_, Sep 06 2017, after _Alois P. Heinz_ at A218320 *) %Y A291928 Cf. A002182, A007416, A025487, A033833, A218320. %K A291928 nonn %O A291928 1,2 %A A291928 _Michael De Vlieger_, Sep 06 2017 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE