Oblong (or pronic) numbers of the form x_n.y_n where z_n indicates the digit z repeated n times.

A289980

Oblong (or pronic) numbers of the form x_n.y_n where z_n indicates the digit z repeated n times.

Terms

    a(0) =12a(1) =20a(2) =30a(3) =42a(4) =56a(5) =72a(6) =90a(7) =1122a(8) =4422a(9) =9900a(10) =111222a(11) =444222a(12) =999000a(13) =11112222a(14) =44442222a(15) =99990000a(16) =1111122222a(17) =4444422222a(18) =9999900000a(19) =111111222222a(20) =444444222222a(21) =999999000000

External references