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

1,2

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

Formula

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

Crossrefs

Cf. A281579.

Sequence in context: A133231 A235111 A228896 * A224854 A074752 A039825

Adjacent sequences: A281780 A281781 A281782 * A281784 A281785 A281786

Keyword

nonn

Author

Rémy Sigrist, Jan 29 2017

Status

approved