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

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

Offset: 1

Author

Jon Perry, Oct 16 2012

Keywords

• nonn

Comments

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.

Crossrefs

Cf. A217866.

Programs

JavaScript

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