Numbers k whose abundance is 2: sigma(k) - 2k = 2.

A088831

Numbers k whose abundance is 2: sigma(k) - 2k = 2.

Terms

    a(0) =20a(1) =104a(2) =464a(3) =650a(4) =1952a(5) =130304a(6) =522752a(7) =8382464a(8) =134193152a(9) =549754241024

External references