a(n) is the smallest number m such that tau(m-1) = tau(m+1) = n*tau(m) or 0 if no such m exists, where tau(k) = A000005(k).

A350935

a(n) is the smallest number m such that tau(m-1) = tau(m+1) = n*tau(m) or 0 if no such m exists, where tau(k) = A000005(k).

Terms

    a(0) =34a(1) =7a(2) =19a(3) =41a(4) =6641a(5) =199a(6) =640063a(7) =919a(8) =17299a(9) =22193a(10) =350632961a(11) =5741a(12) =57394565119a(13) =2345921a(14) =3568049a(15) =18089a(17) =41651a(19) =252881a(20) =88099649a(21) =1439024129a(23) =90271a(24) =821128751a(25) =20969598977a(26) =3959299a(27) =2319679a(29) =7860401

External references