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A359088
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Odd integers k that are not equal to A002326((A005420(k)-1)/2) where A005420(n) is the largest prime factor of 2^n - 1 and A002326(n) is the multiplicative order of 2 mod 2n+1.
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1
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OFFSET
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1,1
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COMMENTS
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LINKS
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PROG
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(PARI) zn(n) = znorder(Mod(2, 2*n+1)); \\ A002326
f(n) = vecmax(factor(2^n-1)[, 1]); \\ A005420
isok(k) = (k%2) && (zn((f(k)-1)/2) != k);
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CROSSREFS
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KEYWORD
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nonn,bref,hard,more
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AUTHOR
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STATUS
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approved
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