A281783 a(n)=index of first term of n-th run of consecutive terms in arithmetic progression in A281579.

1, 2, 3, 5, 7, 9, 12, 16, 19, 21, 23, 25, 27, 30, 34, 39, 45, 50, 54, 57, 60, 63, 65, 66, 67, 68, 70, 73, 76, 79, 82, 86, 91, 97, 104, 110, 115, 119, 122, 124, 126, 128, 130, 132, 134, 136, 139, 143, 148, 154, 161, 167, 172, 176, 179, 182, 185, 188, 192, 197

Offset: 1

Author

Rémy Sigrist, Jan 29 2017

Keywords

• nonn

Comments

This sequence is strictly increasing.

For any n>0, a(n+1)=index of last term of n-th run of consecutive terms in arithmetic progression in A281579.

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A281579.

Formula

a(n)=2-n+Sum_{k=1..n-1} A281579(k) for any n>0.