A356551 - OEIS

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A356551

a(n) = A005132(n+2) - A005132(n).

3, 5, -1, 1, 11, 13, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 35, 37, -1, 1, -1, -45, 1, -1, 1, -1, 1, -1, 1, -1, 1, 65, 67, -1, 1, -1, -75, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 131, 133, -1, 1, -1

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,1

LINKS

Table of n, a(n) for n=0..68.

Index entries for sequences related to Recamán's sequence

PROG

(PARI) vR(nn) = my(s, t, v=vector(nn)); for(n=1, nn, s=bitor(s, 1<<t += if( t<=n || bittest(s, t-n), n, -n)); v[n]=t); concat(0, v); \\ from A005132

lista(nn) = my(v=vR(nn+1)); vector(nn, k, v[k+2] - v[k]); \\ Michel Marcus, Aug 14 2022

(Python)

from itertools import count, islice

def A356551_gen(): # generator of terms