Numbers k such that k*(k+7) is a palindrome.

Terms

a(0) =0a(1) =1a(2) =4a(3) =19a(4) =26a(5) =219a(6) =664a(7) =902a(8) =2109a(9) =2972a(10) =2982a(11) =9002a(12) =21009a(13) =29696a(14) =90002a(15) =210009a(16) =223114a(17) =292967a(18) =669024a(19) =900002a(20) =942997a(21) =2100009a(22) =2109664a(23) =2219779a(24) =8972876a(25) =9000002a(26) =21000009a(27) =21037924a(28) =21117304a(29) =21152824