SOLUTION: 1,4,7,11 Sequence in terms of n

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Question 1021369: 1,4,7,11
Sequence in terms of n
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
Of the 10 digits, 0,1,2,3,4,5,6,7,8,9,

only 1, 4, and 7 can be made with straight lines, and no round parts,
so this is the sequence of numbers that can be made without any round
parts, those using just 1's, 4's and 7's.

1, 4, 7, 11, 14, 17, 41, 44, 47, 71, 74, 77, 111, 114, 117, 141, 144,
147, 171, 174, 177, 411, 414, 417, 441, 444, 447, 471, 474, 477, 711,
714, 717, 741, 744, 747, 771, 774, 777, 1111, 1114, 1117, 1141, 1144,
1147, 1171, 1174, 1177, 1411, 1414, 1417, 1441 



Edwin