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Search: id:A095723
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| A095723 |
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0+1+Prime power perfect numbers: if n=Product p_i^r_i then 01PPsigma(n)= Product {Sum p_i^r_i, 0<=s_i<=r_i, s_i is 0 or one or prime} 01PPsigma(n)=2*n. |
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+0
2
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OFFSET
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1,1
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COMMENT
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Factorizations : 2*3, 2^2*7, 2^5*3*47, 2^4*3^2*5*7*13, 2^7*5^2*7*31
No other terms < 3000000000. - Jud McCranie (j.mccranie(AT)comcast.net), Jul 16 2004
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EXAMPLE
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01PPsigma(2^5*3^3)=(1+2+2^2+2^3+2^5)*(1+3+3^2+3^3)=1880
All exponents of the terms are 0 or 1 or prime.
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CROSSREFS
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Cf. A096290, A095724.
Sequence in context: A066239 A097464 A038182 this_sequence A057246 A154895 A074849
Adjacent sequences: A095720 A095721 A095722 this_sequence A095724 A095725 A095726
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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), Jul 08 2004
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