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A325881
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Bases b where exactly five primes p with p < b exist such that p is a base-b Wieferich prime.
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9
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99, 161, 226, 293, 313, 424, 521, 557, 577, 606, 632, 649, 753, 757, 821, 874, 901, 925, 937, 1030, 1033, 1081, 1108, 1116, 1149, 1342, 1443, 1457, 1524, 1549, 1557, 1586, 1618, 1668, 1777, 1921, 1927, 1929, 1993, 2039, 2060, 2061, 2069, 2077, 2098, 2141, 2269
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OFFSET
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1,1
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COMMENTS
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Numbers n such that A255920(n) = 5.
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LINKS
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PROG
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(PARI) is(n) = my(i=0); forprime(p=1, n-1, if(Mod(n, p^2)^(p-1)==1, i++)); i==5
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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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