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Search: id:A064798
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| A064798 |
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Sum of primes dividing the repunit numbers (with repetition). |
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+0
1
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| 0, 0, 11, 40, 112, 312, 71, 4888, 322, 333710, 9414, 534888, 10073, 265371785, 913990, 2906544, 5882692, 5365294080, 386339, 1111111111111111111, 41017, 10845593, 547805, 11111111111111111111111, 100000284, 182521260315
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,100
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PROGRAM
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(PARI) a(n) = (10^n-1)/9; {sopfr(n, s, fac, i) = fac=factor(n); for(i=1, matsize(fac)[1], s=s+fac[i, 1]*fac[i, 2]); return(s); } for(n=0, 35, print1(sopfr(a(n)), ", "))
(PARI) sopfr(n)= { local(f, s=0); f=factor(n); for(i=1, matsize(f)[1], s+=f[i, 1]*f[i, 2]); return(s) } { for (n=0, 100, write("b064798.txt", n, " ", sopfr((10^n - 1)/9)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 26 2009]
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CROSSREFS
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Cf. A002275, A001414.
Sequence in context: A031427 A147296 A059142 this_sequence A056124 A064768 A135719
Adjacent sequences: A064795 A064796 A064797 this_sequence A064799 A064800 A064801
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Oct 18 2001
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