OFFSET
1,2
LINKS
Carole Dubois, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1) + a(2) = 1 + 9 = 10 with 1 the leftmost digit of both 1 and 10;
a(2) + a(3) = 9 + 81 = 90 with 9 the leftmost digit of both 9 and 90;
a(3) + a(4) = 81 + 2 = 83 with 8 the leftmost digit of both 81 and 83;
a(4) + a(5) = 2 + 18 = 20 with 2 the leftmost digit of both 2 and 20;
a(5) + a(6) = 18 + 82 = 100 with 1 the leftmost digit of both 18 and 100; etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Feb 20 2020
STATUS
approved