Numbers n such that the sum of the sum-of-divisors function of all integers up to n is a square.
A130698
Numbers n such that the sum of the sum-of-divisors function of all integers up to n is a square.
Terms
- a(0) =1a(1) =2a(2) =53a(3) =174a(4) =299a(5) =1377a(6) =12695a(7) =44469a(8) =423922a(9) =2068248a(10) =12084331a(11) =46270468a(12) =1330157705a(13) =5319721272a(14) =144083207084a(15) =178358383042a(16) =212557463865
External references
- oeis: A130698