A269968 -id:A269968 - cp's OEIS frontend

A269967 Indices of zeros in A269783.

0, 1, 4, 7, 15, 23, 40, 55, 85, 111, 158, 197, 265, 323, 416, 493, 615, 719, 874, 1005, 1197, 1361, 1594, 1793, 2071, 2313, 2640, 2921, 3301, 3633, 4070, 4453, 4951, 5389, 5952, 6447, 7079, 7641, 8346, 8971, 9753, 10453, 11316, 12087, 13035, 13885, 14922

Offset: 1

M. F. Hasler, Mar 08 2016

nonn

Sequence A269783 is defined by A269783(0)=0 and A269783(n+1) = A269783(n) + (-1)^(k+e)*floor(k/2), where k = #{ j<=n | A269783(j)=A269783(n) } and e=1 for A269783(n)>0, else e=0. That is, the 1st, 2nd, 3rd, 4th... occurrence of any positive integer n is followed by n resp. n-1 resp. n+1 resp. n-2, etc., and for zero or negative integers the same with opposite sign.

Rémy Sigrist, Table of n, a(n) for n = 1..10000
Rémy Sigrist, C++ program

Cf. A269783 (main sequence), A269968 (index of first occurrence of n), A269969 (index of first occurrence of -n).

More terms from Rémy Sigrist, May 21 2023

A269969 Index of first occurrence of -n in A269783.

Original entry on oeis.org

0, 5, 16, 20, 42, 47, 51, 88, 97, 102, 106, 164, 175, 182, 187, 191, 274, 289, 300, 307, 312, 316, 428, 447, 460, 469, 476, 481, 485, 632, 657, 672, 685, 694, 701, 706, 710, 894, 923, 944, 959, 970, 979, 986, 991, 995, 1222, 1257, 1282, 1299, 1314, 1325, 1334

Offset: 0

M. F. Hasler, Mar 08 2016

nonn

Rémy Sigrist, Table of n, a(n) for n = 0..10000
Rémy Sigrist, PARI program

Cf. A269783 (main sequence), A269967 (indices of zeros), A269968 (index of first occurrence of n).

PARI
```
See Links section.
```

More terms from Rémy Sigrist, May 21 2023

cp's OEIS Frontend

A269967 Indices of zeros in A269783.

Views

Author

Keywords

Comments

Links

Crossrefs

Extensions