Let H(n) be the reduced fraction Sum_{i=1..n} 1/i. a(n) is the least factor of H(n)'s numerator or denominator that doesn't divide either part of any earlier H(m).
A113571
Let H(n) be the reduced fraction Sum_{i=1..n} 1/i. a(n) is the least factor of H(n)'s numerator or denominator that doesn't divide either part of any earlier H(m).
Terms
- a(0) =1a(1) =2a(2) =6a(3) =4a(4) =10a(5) =7a(6) =14a(7) =8a(8) =9a(9) =61a(10) =22a(11) =13a(12) =26a(13) =1049a(14) =41233a(15) =16a(16) =34a(17) =19a(18) =38a(19) =11167027a(20) =18858053a(21) =23a(22) =46a(23) =138a(24) =50a(25) =34395742267a(26) =27a(27) =841a(28) =58a(29) =31
External references
- oeis: A113571