a(1) = least k such that 1/2 + 1/3 < H(k) - H(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.
A227653
a(1) = least k such that 1/2 + 1/3 < H(k) - H(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) =8a(1) =21a(2) =54a(3) =138a(4) =352a(5) =897a(6) =2285a(7) =5820a(8) =14823a(9) =37752a(10) =96148a(11) =244872a(12) =623645a(13) =1588311a(14) =4045140a(15) =10302237a(16) =26237926a(17) =66823230a(18) =170186624a(19) =433434405a(20) =1103878665a(21) =2811378360a(22) =7160069791a(23) =18235396608a(24) =46442241368a(25) =118279949136a(26) =301237536249a(27) =767197263003
External references
- oeis: A227653