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A094153
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a(n) is least prime p such that 7 is the n-th term in the Euclid-Mullin sequence starting at p, or 0 if no such prime p exists.
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4
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7, 0, 2, 43, 11, 13, 31, 149, 347, 23, 439, 223, 461, 173, 5, 71, 197, 1153, 191, 307, 1657, 971, 9473, 19, 2399, 1607, 6781, 89, 9187, 281, 23623, 15077, 25579, 17203
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OFFSET
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1,1
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COMMENTS
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The sequence is not monotonic. Compare to A093882.
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LINKS
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EXAMPLE
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a(5)=11 because p=7 first arises in EM at position 5, which is initiated with 11: {11,2,23,3,7,10627,433}; see A051309.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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Definition clarified, terms corrected and extended by Sean A. Irvine, Apr 15 2011
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STATUS
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approved
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