OFFSET

0,2

COMMENTS

Indices n such that a(n)=n:

3, 4, 69, 709, 4267, 11807, 53694, 172760, 243621, 2097734, 1219835399, 1285668346.

Conjectures:

1. Sequence contains infinitely many terms such that a(n)=n.

2. Infinitely many 1's.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

nxt[{n_, a_, b_}]:={n+1, b, Mod[a*b, n+1]+1}; NestList[nxt, {1, 1, 2}, 80][[All, 2]] (* Harvey P. Dale, Apr 16 2022 *)

PROG

(Python)

prpr = 1

prev = 2

for n in range(2, 99):

current = (prpr * prev) % n + 1

print prpr,

prpr = prev

prev = current

CROSSREFS

KEYWORD

nonn,easy

AUTHOR

Alex Ratushnyak, May 03 2012

STATUS

approved