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 A217866 Last time n appears in the first differences of n*log(n): A217865. 1
 1, 5, 18, 46, 137, 384, 1059, 2905, 8066, 21883, 59743, 162247, 441824 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Conjecture: the last time n appears is always before the first time n+2 appears. For example, examine: 1, 2, 2, 3, 2, 3, 3, 3, 4, 3, 3, 4, 3, 4, 4, 4, 4, 3, 4, 4, 5, 4, 4, 4 (A217865). We can see that the last 2 is before the first 4, the last 3 is before the first 5, etc. LINKS EXAMPLE 2 lasts appears in A217865 at position 5 so a(2)=5. PROG (JavaScript) function lastIndex(arr, k) { p=-1; for (a=1; a

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