A367084 Indices k such that A367083(k) and A367083(k+1) are both odd.

0, 7, 16, 25, 34, 43, 50, 59, 68, 77, 86, 95, 102, 111, 120, 129, 138, 145, 154, 163, 172, 181, 190, 197, 206, 215, 224, 233, 240, 249, 258, 267, 276, 285, 292, 301, 310, 319, 328, 335, 344, 353, 362, 371, 380, 387, 396, 405, 414, 423, 430, 439, 448, 457, 466, 475, 482, 491, 500

Offset: 0

Author

M. F. Hasler, Nov 03 2023

Keywords

• nonn

Comments

First differences are either 7 (in isolated positions) or 9 (always 4 or 5 times consecutively in a row). It is interesting to study these run lengths, see A367083 for further information.

Crossrefs

Cf. A367083, A327621.

Programs

PARI

A367084_upto(N) = [n|n<-A=A367083_upto(N), A[n+1]==Mod(A[n],2)]

Python

from itertools import islice
def A367084_gen(): # generator of terms
    a, b, c = 1, 4, -1
    while True:
        while (a:=a*3)A367084_list = list(islice(A367084_gen(),30)) # Chai Wah Wu, Nov 08 2023