Denominator of n-th term of the harmonic series after removal of all terms 1/m from Sum_{m=1..n} 1/m for which m contains a 9 in its decimal representation.
A111936
Denominator of n-th term of the harmonic series after removal of all terms 1/m from Sum_{m=1..n} 1/m for which m contains a 9 in its decimal representation.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =12a(4) =60a(5) =20a(6) =140a(7) =280a(8) =280a(9) =3080a(10) =9240a(11) =120120a(12) =120120a(13) =40040a(14) =80080a(15) =1361360a(16) =12252240a(17) =2450448a(18) =2450448a(19) =2450448a(20) =56360304a(21) =56360304a(22) =1409007600a(23) =1409007600a(24) =4227022800a(25) =4227022800a(26) =4227022800a(27) =131037706800a(28) =262075413600
External references
- oeis: A111936