Numbers k such that k concatenated with itself gives the product of two numbers which differ by 7.

A116160

Numbers k such that k concatenated with itself gives the product of two numbers which differ by 7.

Terms

    a(0) =4a(1) =94a(2) =210a(3) =294a(4) =994a(5) =5880a(6) =9994a(7) =52888a(8) =99994a(9) =127044a(10) =414180a(11) =999994a(12) =8264470a(13) =9999994a(14) =12456750a(15) =41868508a(16) =99999994a(17) =112670544a(18) =441341880a(19) =468144040a(20) =669421494a(21) =702338994a(22) =715976338a(23) =750005718a(24) =960645294a(25) =999999994

External references