Find the missing number of sequence

[From: ] [author: ] [Date: 11-05-08] [Hit: ]

6, 19, 71, x, 1111

I know it's 279 but I can't figure out what's the exact progression.

times 4 minus 5 dawg

6x4-5=19
19x4-5=71
71x4-5=279
279x4-5=1111

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