A135409 Sum of all n-digit Keith numbers.

0, 244, 939, 38842, 399158, 3185054, 8997888, 89003533, 380705305, 0, 120958456566, 909738914355, 10691161155707, 215413743487843, 1146359095715014, 11741086634604569, 186260344930883645, 586697640742217928, 22434377949474656108, 86030233471862779595

Offset

1,2

Comments

There are no 1-digit and 10-digit Keith numbers.

Links

Table of n, a(n) for n=1..20.

Jason Earls and Eric Weisstein's World of Mathematics, Keith Number.

Example

Sum of all 2-digit Keith numbers is 244.
Sum of all 3-digit Keith numbers is 939.
Sum of all 4-digit Keith numbers is 38842.

Crossrefs

Cf. A007629.

Sequence in context: A234262 A031786 A328206 * A203349 A262092 A178266

Adjacent sequences: A135406 A135407 A135408 * A135410 A135411 A135412

Keyword

nonn,base

Author

Parthasarathy Nambi, Dec 10 2007

Extensions

Extended by T. D. Noe, Mar 15 2011

Status

approved