Hello Math-fun fans, I've just submitted this to Sloane's OEIS: 1 2 3 4 5 6 7 8 9 11 13 15 17 19 22 31 33 35 37 39 44 51 53 55 57 59 66 71 73 75 77 79 88 91 93 95 97 99 111 222 225 228 252 255 258 282 285 288 333 444 522 525 528 552 555 558 582 585 666 777 822 825 828 852 855 882 888 999 1111 1313 1317... "Jump-my-digits" numbers. Take any integer of the sequence and repeat it as many times as you wish -- like this (for 258): 258,258,258,258,258,258,258,... Choose now any digit of 258, "2", for instance, and jump over the next 2 digits: you'll land on another "2". The same can be done with "5" and with "8": jumping respectively over 5 and 8 digits will see you land on another "5" or another "8". Question: What could be the smallest such number containing all 10 different digits? (0->9) If it doesn't exist, the smallest one containing 9 different digits, etc. Best, É.