A217865 -id:A217865 - cp's OEIS frontend

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

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.

Cf. A217865.

Cf. A217976.

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

A217976 First time n appears in the first differences of n*log(n): A217865.

Original entry on oeis.org

1, 2, 4, 9, 21, 62, 159, 422, 1134, 3056, 8139, 22169, 60004, 163262, 443002

Offset: 1

Jon Perry, Oct 16 2012

nonn

Conjecture: the last time n appears is always before the first time n+2 appears.

For example the last time 5 appears is at position 135, the first time 7 appears is at position 159.

Cf. A217866.

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

cp's OEIS Frontend

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

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