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Search: id:A097464
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| A097464 |
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5-infinitary perfect numbers: n such that 5-infinitary-sigma(n)=2*n. |
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2
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OFFSET
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1,1
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COMMENT
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Here 5-infinitary-sigma(a) means sum of 5-infinitary-divisor of a. If n=Product p_i^r_i and d=Product p_i^s_i, each s_i has a digit a<=b in its 5-ary expansion everywhere that the corresponding r_i has a digit b, then d is a 5-infinitary-divisor of n.
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EXAMPLE
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Factorizations: 2*3, 2^2*7, 2^4*31, 2^5*3^2*7*11*13, 2^10*3*5*7*19*151
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CROSSREFS
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Cf. A074849.
Sequence in context: A000396 A152953 A066239 this_sequence A038182 A095723 A057246
Adjacent sequences: A097461 A097462 A097463 this_sequence A097465 A097466 A097467
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KEYWORD
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nonn
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AUTHOR
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Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp) Yasutoshi
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