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OFFSET
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1,1
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COMMENTS
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Note a connection to the Wieferich primes A001220: a(3) = A001220(1) - 1. a(4) = (A001220(2)-1)/2. a(5) = A001220(2) - 1.
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LINKS
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Table of n, a(n) for n=1..7.
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PROG
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(PARI) a001008(n)=numerator(sum(i=1, n, 1/i))
for(n=1, 1e6, if(gcd(a001008(n), a001008(n/2)) > 1, print1(n, ", "))) \\ Felix Fröhlich, Aug 08 2014
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CROSSREFS
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The corresponding GCDs are given by A126197.
Cf. A001008, A125581, A001220, A002805, A058313, A058312, A074791, A121594
Sequence in context: A003396 A124899 A056852 * A182433 A093169 A159029
Adjacent sequences: A126193 A126194 A126195 * A126197 A126198 A126199
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KEYWORD
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nonn,more
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AUTHOR
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Max Alekseyev and Tanya Khovanova, Mar 07 2007, corrected Mar 10 2007
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STATUS
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approved
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