Numbers k which when sandwiched between two 2's give a multiple of k.

Terms

a(0) =1a(1) =2a(2) =11a(3) =13a(4) =14a(5) =22a(6) =26a(7) =77a(8) =91a(9) =137a(10) =146a(11) =274a(12) =9091a(13) =19802a(14) =909091a(15) =5882353a(16) =10989011a(17) =12987013a(18) =13986014a(19) =15037594a(20) =21978022a(21) =25974026a(22) =52631579a(23) =76923077a(24) =90909091a(25) =198019802a(26) =1652892562a(27) =4347826087a(28) =8695652174a(29) =9090909091