A141835 a(n) = Sum of terms in A062901 which are below 10^n.

0, 7, 154, 10787, 1029567, 105714126, 10363989636, 1027216680497, 102184086890270, 10205609904879424, 1020424310227628614, 102049428685193293045, 10204479595989795520404, 1020425244837350504933851, 102041179796115463104759635, 10204085511291024760949778376

Offset

0,2

Comments

a(n) rapidly approaches 10^(2n)/98.

Calculating these terms appears in several places on the Internet as a sample interview problem.

Links

J. Wellons, Table of n, a(n) for n = 0..300

J. Wellons, An Algorithm to Compute these Terms very Efficiently

Example

The elements of A062901 less than 1000 are 0, 7, 70, 77, 161, 168, 252, 259, 343, 434, 525, 595, 616, 686, 700, 707, 770, 777, 861, 868, 952 and 959. Their sum is a(3) = 10787.

Crossrefs

Cf. A062901

Sequence in context: A296232 A279662 A214382 * A111831 A288545 A139226

Adjacent sequences: A141832 A141833 A141834 * A141836 A141837 A141838

Keyword

nonn

Author

Jonathan Wellons (wellons(AT)gmail.com), Jul 09 2008

Status

approved