1,1

Is the sequence infinite?

All terms listed are of the form == 7 (mod 8). Is there a reason for this phenomenon?

Conjecture: The numbers 2^k-1 for k > 2 are terms. - Chai Wah Wu, Sep 02 2021

Table of n, a(n) for n=1..22.

{n : A061712(n) < A061712(n-1)}.

Cf. A061712.

Sequence in context: A004771 A029724 A194400 * A243582 A336819 A056828

Adjacent sequences: A177765 A177766 A177767 * A177769 A177770 A177771

nonn,more,base

Vladimir Shevelev, May 13 2010

a(20)-a(22) from Chai Wah Wu, Sep 06 2021

approved