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A074249
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a(0) = 1; for n > 0, a(n) = largest prime factor of 7^n-1.
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1
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1, 3, 3, 19, 5, 2801, 43, 4733, 1201, 1063, 2801, 293459, 181, 16148168401, 4733, 159871, 169553, 2767631689, 117307, 4534166740403, 4021, 11898664849, 10746341, 31479823396757, 1201, 31280679788951, 16148168401, 2583253
(list; graph; refs; listen; history; internal format)
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