a(1) = least k such that 1/3 < H(k) - 1/3; a(2) = least k such that H(a(1)) - H(3) < H(k) - H(a(1)), and for n > 2, a(n) = least k such that H(a(n-1)) - H(a(n-2)) > H(k) - H(a(n-1)), where H = harmonic number.
A225605
a(1) = least k such that 1/3 < H(k) - 1/3; a(2) = least k such that H(a(1)) - H(3) < H(k) - H(a(1)), and for n > 2, a(n) = least k such that H(a(n-1)) - H(a(n-2)) > H(k) - H(a(n-1)), where H = harmonic number.
Terms
- a(0) =5a(1) =9a(2) =16a(3) =29a(4) =53a(5) =97a(6) =178a(7) =327a(8) =601a(9) =1105a(10) =2032a(11) =3737a(12) =6873a(13) =12641a(14) =23250a(15) =42763a(16) =78653a(17) =144665a(18) =266080a(19) =489397a(20) =900141a(21) =1655617a(22) =3045154a(23) =5600911a(24) =10301681a(25) =18947745a(26) =34850336a(27) =64099761a(28) =117897841a(29) =216847937
External references
- oeis: A225605