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Search: id:A063955
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| 0, 2, 5, 3, 8, 5, 12, 12, 12, 7, 18, 18, 31, 24, 24, 24, 41, 41, 60, 60, 60, 49, 72, 72, 72, 59, 59, 59, 88, 88, 119, 119, 119, 102, 102, 102, 139, 120, 120, 120, 161, 161, 204, 204, 204, 181, 228, 228, 228, 228, 228, 228, 281, 281, 281, 281, 281, 252, 311, 311
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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Prime factors in 20! which have exponent=1 [i.e. unitary p-divisors] are {11,13,17,19}, sum =60 so a(20)=60. Sum of its all prime-factors is given in A034387(20).
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PROGRAM
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(PARI) { for (n=1, 1000, f=factor(n!)~; a=0; for (i=1, length(f), if (f[2, i]==1, a+=f[1, i])); write("b063955.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 04 2009]
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CROSSREFS
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A056169-A056172, A034387, A034444.
Sequence in context: A134563 A021398 A115318 this_sequence A097594 A050171 A136189
Adjacent sequences: A063952 A063953 A063954 this_sequence A063956 A063957 A063958
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 04 2001
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