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A137990
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Least prime p of the form c3^n+1 with c not divisible by 3.
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1
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2, 7, 19, 109, 163, 487, 1459, 17497, 52489, 39367, 472393, 4960117, 5314411, 102036673, 19131877, 57395629, 86093443, 258280327, 3874204891, 23245229341, 90656394427, 585779779369, 251048476873, 9790890598009, 4518872583697
(list; graph; refs; listen; history; internal format)
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