1,1

a(n) == 0 (mod 8).

If a*b = k*a(n) + 1 then b - a == 0 (mod 8), 1 < a < b < a(n), 1 <= k < a(n).

gcd(k, a*b) = 1.

Table of n, a(n) for n=1..35.

32 is a term because A329152(32) = 6 and 6 occurs exactly once in A329152.

240 is a term because A329152(240) = 24 and 24 occurs exactly once in A329152.

512 is a term because A329152(512) = 126 and 126 occurs exactly once in A329152.

Cf. A329152.

Subset of A008590.

Sequence in context: A229400 A223250 A250748 * A060622 A118999 A321829

Adjacent sequences: A333265 A333266 A333267 * A333269 A333270 A333271

nonn

Torlach Rush, Mar 13 2020

approved