Numbers k such that k*sigma(k) is a palindrome.

Terms

a(0) =1a(1) =2a(2) =141a(3) =517a(4) =1089a(5) =1621a(6) =1651a(7) =2359a(8) =17529a(9) =20086a(10) =124282a(11) =1664338a(12) =72452549a(13) =1503846167a(14) =14457164981a(15) =17107594211a(16) =17458514913a(17) =24556027479