OFFSET
1,2
LINKS
Scott Shannon, Table of n, a(n) for n = 1..3656
EXAMPLE
1, 10, 11, 100, 21, 58, 51, 69,
a(1)*a(2) = 1*10 = 100 with 1 substring of 100;
a(2)*a(3) = 10*11 = 110 with 10 substring of 110;
a(3)*a(4) = 11*100 = 1100 with 11 substring of 1100;
a(4)*a(5) = 100*21 = 2100 with 100 substring of 2100;
a(5)*a(6) = 21*58 = 1218 with 21 substring of 1218;
a(6)*a(7) = 58*51 = 2958 with 58 substring of 2958;
a(7)*a(8) = 51*69 = 3519 with 51 substring of 3519; etc.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Feb 20 2020
STATUS
approved