A217976 -id:A217976 - cp's OEIS frontend

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A217866 Last time n appears in the first differences of n*log(n): A217865.

Original entry on oeis.org

1, 5, 18, 46, 137, 384, 1059, 2905, 8066, 21883, 59743, 162247, 441824

Offset: 1

Jon Perry, Oct 13 2012

nonn

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.

			2 lasts appears in A217865 at position 5 so a(2)=5.

function lastIndex(arr,k) {
p=-1;
for (a=1;a

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