Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
0,2
a(n) rapidly approaches 10^(2n)/98.
Calculating these terms appears in several places on the Internet as a sample interview problem.
J. Wellons, Table of n, a(n) for n = 0..300
J. Wellons, An Algorithm to Compute these Terms very Efficiently
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.
Cf. A062901
Sequence in context: A144683 A229711 A214382 * A111831 A139226 A220367
Adjacent sequences: A141832 A141833 A141834 * A141836 A141837 A141838
nonn
Jonathan Wellons (wellons(AT)gmail.com), Jul 09 2008
approved