Numbers n such that sigma(n)*7 < sigma(n-1) + sigma(n+1).

Terms

a(0) =41902660799a(1) =41902660801a(2) =48886437599a(3) =53542288799a(4) =55870214401a(5) =62853991199a(6) =73329656401a(7) =80313433201a(8) =96376119841a(9) =97772875199a(10) =97772875201a(11) =101264763599a(12) =107084577599a(13) =107221514401a(14) =118356638399a(15) =118356638401a(16) =125707982401a(17) =128501493121a(18) =135019684799