Smallest multiple of n^2 beginning and ending in n, or 0 if no such multiple exists.

Terms

a(0) =1a(1) =212a(2) =333a(3) =464a(4) =525a(5) =6156a(6) =7007a(7) =8128a(8) =9639a(9) =0a(10) =11011a(11) =122112a(12) =13013a(13) =0a(14) =0a(15) =162816a(16) =1720417a(17) =0a(18) =1905719a(19) =0a(20) =212121a(21) =0a(22) =2320723a(23) =244224a(24) =25625a(25) =0a(26) =2743227a(27) =287728a(28) =2917429a(29) =0