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Search: id:A033913
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| A033913 |
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Numbers n such that s(n)+s(n+1)+...+s(n+6)=t(n)+t(n+1)+...+t(n+6). |
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+0
1
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OFFSET
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1,1
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FORMULA
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Here s(n)=sigma(n)-n, t(n)=|s(n)-n|.
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PROGRAM
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(PARI) l=vector(7, n, abs(sigma(n)-2*n)-sigma(n)+n); l[7]=0; sc=sum(n=1, 7, l[n]); for(n=7, 1000000, m=sigma(n)-2*n; d=abs(m)-m-n; i=(n-1)%7+1; sc=sc-l[i]+d; l[i]=d; if(sc==0, print1(n-6, ", "))) (C. Ronaldo)
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CROSSREFS
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Sequence in context: A072743 A045452 A128927 this_sequence A088124 A029456 A110208
Adjacent sequences: A033910 A033911 A033912 this_sequence A033914 A033915 A033916
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KEYWORD
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nonn
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AUTHOR
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Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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EXTENSIONS
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More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 02 2005
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