Solutions k of the equation usigma(k) = usigma(k-1) + usigma(k-2) where usigma(k) is the sum of unitary divisors of k (A034448).

A332973

Solutions k of the equation usigma(k) = usigma(k-1) + usigma(k-2) where usigma(k) is the sum of unitary divisors of k (A034448).

Terms

    a(0) =3a(1) =42a(2) =188970a(3) =998670a(4) =51670374a(5) =91397154a(6) =236280786a(7) =259172826a(8) =792554574a(9) =1106710914a(10) =1468869930a(11) =1957827498a(12) =2467823442a(13) =2496238590a(14) =3324585210a(15) =4055970282a(16) =4183629690a(17) =4384566870a(18) =13479861630a(19) =20681058270a(20) =29343074178a(21) =43449285210a(22) =68705958690a(23) =71418085926

External references