a(1) = greatest k such that H(k) - H(4) < 1/3 + 1/4; a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(4); and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.
A224868
a(1) = greatest k such that H(k) - H(4) < 1/3 + 1/4; a(2) = greatest k such that H(k) - H(a(1)) < H(a(1)) - H(4); and for n > 2, a(n) = greatest k such that H(k) - H(a(n-1)) > H(a(n-1)) - H(a(n-2)), where H = harmonic number.
Terms
- a(0) =7a(1) =11a(2) =17a(3) =26a(4) =39a(5) =58a(6) =86a(7) =127a(8) =187a(9) =275a(10) =404a(11) =593a(12) =870a(13) =1276a(14) =1871a(15) =2743a(16) =4021a(17) =5894a(18) =8639a(19) =12662a(20) =18558a(21) =27199a(22) =39863a(23) =58423a(24) =85624a(25) =125489a(26) =183914a(27) =269540a(28) =395031a(29) =578947
External references
- oeis: A224868