A068326 a(n) = Product_{k=1..n} A031974(k).

1, 11, 1221, 13566531, 15073921825941, 167488020286558453130451, 186097800318379671476024826838541061, 2067753336870885217944964707274937180441685906828771, 2297503707634316908597988192875387398496877151223641424395368232574581

Offset

0,2

Links

Table of n, a(n) for n=0..8.

Prog

(PARI) a(n) = prod(k=1, n, (10^prime(k) - 1)/9); \\ Michel Marcus, Jan 04 2021

Crossrefs

Cf. A031974.

Sequence in context: A259937 A078269 A015009 * A001323 A266368 A182553

Adjacent sequences: A068323 A068324 A068325 * A068327 A068328 A068329

Keyword

nonn,base

Author

Jani Melik, Feb 27 2002

Extensions

More terms from Jason Earls, May 19 2002

Status

approved