Numbers k that divide sigma(k-1)+sigma(k)+sigma(k+1), where sigma() is the "sum of integer divisors" function.

A072188

Numbers k that divide sigma(k-1)+sigma(k)+sigma(k+1), where sigma() is the "sum of integer divisors" function.

Terms

    a(0) =2a(1) =5a(2) =7a(3) =33a(4) =18336a(5) =19262a(6) =38184a(7) =54722a(8) =458010a(9) =1402224a(10) =1473624a(11) =1708480a(12) =3680560a(13) =3733584a(14) =5829841a(15) =7769904a(16) =13204262a(17) =72873362a(18) =136910448a(19) =252961224a(20) =509874800a(21) =1138081558a(22) =3414097921a(23) =5440847376a(24) =7285326504a(25) =8986032648a(26) =14409659936a(27) =15953956256a(28) =23556877704

External references