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A033914 Numbers k such that s(k) + s(k+1) + ... + s(k+7) = t(k) + t(k+1) + ... + t(k+7). 1
34, 397, 1397, 1433, 1464, 2263, 3622, 3865, 5812, 7077, 10225, 27586, 291197, 313675, 458424, 477910, 566857, 585175, 1484279, 2831716, 7375819, 85175017, 97778116, 7790944015, 8083150857, 9521308617, 36133355554 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(28) > 10^11. - Donovan Johnson, Aug 15 2011
LINKS
FORMULA
Here s(k) = sigma(k) - k, t(k) = |s(k) - k|.
PROG
(PARI) l=vector(8, n, abs(sigma(n)-2*n)-sigma(n)+n); l[8]=0; sc=sum(n=1, 8, l[n]); for(n=8, 1000000, m=sigma(n)-2*n; d=abs(m)-m-n; i=(n-1)%8+1; sc=sc-l[i]+d; l[i]=d; if(sc==0, print1(n-7, ", "))) \\ C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 02 2005
CROSSREFS
Sequence in context: A228995 A135243 A283227 * A189452 A159655 A271036
KEYWORD
nonn,more
AUTHOR
EXTENSIONS
More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 02 2005
a(19)-a(27) from Donovan Johnson, Aug 15 2011
STATUS
approved

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Last modified March 29 06:15 EDT 2024. Contains 371265 sequences. (Running on oeis4.)