a(n) = lcm_{d|n} sigma(d) * Sum_{d|n} 1/sigma(d), where sigma(d) represents the sum of divisors of d (A000203(d)).
A265708
a(n) = lcm_{d|n} sigma(d) * Sum_{d|n} 1/sigma(d), where sigma(d) represents the sum of divisors of d (A000203(d)).
Terms
- a(0) =1a(1) =4a(2) =5a(3) =31a(4) =7a(5) =20a(6) =9a(7) =162a(8) =69a(9) =28a(10) =13a(11) =155a(12) =15a(13) =36a(14) =35a(15) =5127a(16) =19a(17) =276a(18) =21a(19) =217a(20) =45a(21) =52a(22) =25a(23) =810a(24) =223a(25) =60a(26) =703a(27) =279a(28) =31a(29) =140
External references
- oeis: A265708