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A298951
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Wieferich primes to base 22.
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4
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OFFSET
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1,1
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COMMENTS
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Prime numbers p such that p^2 divides 22^(p-1) - 1.
Next term, if it exists, is larger than 8.72*10^13.
492366587 was found by Montgomery (cf. Montgomery, 1993). - Felix Fröhlich, Jan 30 2018
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LINKS
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PROG
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(PARI) forprime(p=1, , if(Mod(22, p^2)^(p-1)==1, print1(p, ", ")))
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CROSSREFS
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Wieferich primes to base b: A001220 (b=2), A014127 (b=3), A123692 (b=5), A212583 (b=6), A123693 (b=7), A045616 (b=10), A111027 (b=12), A128667 (b=13), A234810 (b=14), A242741 (b=15), A128668 (b=17), A244260 (b=18), A090968 (b=19), A242982 (b=20), this sequence (b=22), A128669 (b=23), A306255 (b=26), A306256 (b=30).
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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