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A366648
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Numbers k such that 4^k + 1 is a semiprime.
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0
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3, 6, 10, 14, 16, 20, 32, 46, 52, 64, 74, 128, 178, 298, 346, 502, 614, 634, 1912, 60394, 92116
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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14 is in this sequence because 4^14+1 = 17*15790321 is a semiprime.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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