a(n) = least m such that if r and s in {1/3, 1/6, 1/9,..., 1/3n} satisfy r < s, then r < k/m < s for some integer k.

A024824

a(n) = least m such that if r and s in {1/3, 1/6, 1/9,..., 1/3n} satisfy r < s, then r < k/m < s for some integer k.

Terms

    a(0) =4a(1) =7a(2) =19a(3) =28a(4) =49a(5) =61a(6) =91a(7) =127a(8) =148a(9) =193a(10) =244a(11) =271a(12) =331a(13) =397a(14) =469a(15) =508a(16) =589a(17) =676a(18) =769a(19) =817a(20) =919a(21) =1027a(22) =1141a(23) =1261a(24) =1324a(25) =1453a(26) =1588a(27) =1729a(28) =1876a(29) =1951

External references