3-deficient numbers with increasing abundancy: Numbers k such that sigma(m)/m < sigma(k)/k < 3 for all numbers m < k such that sigma(m)/m < 3.

A307122

3-deficient numbers with increasing abundancy: Numbers k such that sigma(m)/m < sigma(k)/k < 3 for all numbers m < k such that sigma(m)/m < 3.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =24a(6) =36a(7) =48a(8) =60a(9) =168a(10) =252a(11) =300a(12) =336a(13) =630a(14) =2268a(15) =2310a(16) =5472a(17) =6804a(18) =20412a(19) =47424a(20) =61236a(21) =161304a(22) =183708a(23) =486096a(24) =551124a(25) =1215216a(26) =1653372a(27) =4081104a(28) =4960116a(29) =14880348

External references