a(n) = least m such that if r and s in {1/1, 1/2, 1/3, ..., 1/n} satisfy r < s, then r < k/m < (k+4)/m < s for some integer k.
A024846
a(n) = least m such that if r and s in {1/1, 1/2, 1/3, ..., 1/n} satisfy r < s, then r < k/m < (k+4)/m < s for some integer k.
Terms
- a(0) =11a(1) =29a(2) =55a(3) =89a(4) =131a(5) =181a(6) =239a(7) =305a(8) =379a(9) =461a(10) =551a(11) =661a(12) =769a(13) =898a(14) =1023a(15) =1171a(16) =1313a(17) =1480a(18) =1639a(19) =1825a(20) =2001a(21) =2206a(22) =2399a(23) =2623a(24) =2833a(25) =3076a(26) =3303a(27) =3565a(28) =3809a(29) =4090
External references
- oeis: A024846