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Search: id:A092873
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| 3, 5, 11, 17, 41, 83, 137, 257, 641, 1097, 17477, 65537, 140417, 557057, 2384897, 4227137, 35946497, 71304257, 541073537, 2281701377, 2336533512737, 600470787982337, 2278291849363457, 4538923050090497, 38280596832649217
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OFFSET
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1,1
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COMMENT
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Catlin shows that if A007755(n) is odd and composite, then its factors are among the A007755(k), k < n. Note that the five Fermat primes are in this sequence.
Interestingly, for p in this sequence, p-1 = 2^k Q, where all the factors of Q are in this sequence also. - T. D. Noe (noe(AT)sspectra.com), Aug 03 2005
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REFERENCES
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P. A. Catlin, Concerning the iterated phi function, Amer. Math. Monthly, Vol. 77, No. 1 (Jan., 1970), 60-61.
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CROSSREFS
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Sequence in context: A096479 A129809 A040176 this_sequence A019386 A101781 A101783
Adjacent sequences: A092870 A092871 A092872 this_sequence A092874 A092875 A092876
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KEYWORD
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nonn
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AUTHOR
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T. D. Noe (noe(AT)sspectra.com), Mar 08 2004
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EXTENSIONS
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More terms from T. D. Noe (noe(AT)sspectra.com), Aug 03 2005
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