Least k for which Omega(6k-1) + Omega(6k+1) >= n.

Terms

a(0) =1a(1) =1a(2) =4a(3) =20a(4) =41a(5) =104a(6) =479a(7) =1146a(8) =7603a(9) =16521a(10) =91146a(11) =188021a(12) =188021a(13) =1861979a(14) =14122396a(15) =43294271a(16) =203450521a(17) =203450521a(18) =5877278646a(19) =5900065104a(20) =16886393229