Search: a154554 -id:a154554
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A154555
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Primes p such that m=(p-1)/2 is the least number such that p divides m!+1.
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+10
2
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7, 11, 19, 43, 47, 127, 131, 163, 179, 191, 199, 263, 347, 367, 419, 431, 443, 491, 503, 523, 571, 619, 691, 727, 743, 787, 839, 863, 1051, 1087, 1091, 1123, 1291, 1319, 1367, 1451, 1487, 1499, 1571, 1579, 1583, 1667, 1723, 1783, 1823, 1931, 1951, 2003, 2039
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OFFSET
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1,1
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COMMENTS
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The graph of A073944 shows two prominent curves. This sequence gives the primes on the lower curve. Primes on the upper curve are in sequence A154554.
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LINKS
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MATHEMATICA
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Rest[Reap[Do[p=Prime[i]; f=1; m=1; While[f=Mod[f*m, p]; f+1<p, m++ ]; If[m==(p-1)/2, Sow[p]], {i, 400}]]][[1, 1]]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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