Karama, Muneer Jebreel
(2006)
In [1], C. Ashbacher, studied the Smarandache reverse sequence: 1, 21, 321, 4321, 54321,
654321, 7654321, 87654321, 987654321, 10987654321, 1110987654321,(1) and he
checked the first 35 elements and no prime were found. ...