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Search: id:A098934
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| A098934 |
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Numbers n such that the sum of the first n digits of pi are divisible by n. |
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+0
1
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OFFSET
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1,2
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COMMENT
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For large n, A046974(n-1)/n is very close to 4.5, so is never an integer. - David Wasserman (dwasserm(AT)earthlink.net), Feb 27 2008
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EXAMPLE
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a[1] = 1 since 3 is divisible by 1
a[2] = 2 since 3+1 = 4 is divisible by 2
a[3] <> 3 since 3 + 1 + 4 = 8 is not divisible by 3
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MATHEMATICA
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$MaxPrecision = 2500000; pd = RealDigits[N[Pi, 2000000]][[1]]; s = 0; Do[s = s + pd[[n]]; If[ Mod[s, n] == 0, Print[n]], {n, 2000000}] (from Robert G. Wilson v Oct 21 2004)
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CROSSREFS
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Cf. A046974.
Sequence in context: A065554 A034042 A138759 this_sequence A043307 A049343 A131140
Adjacent sequences: A098931 A098932 A098933 this_sequence A098935 A098936 A098937
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KEYWORD
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base,easy,fini,full,nonn
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AUTHOR
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Anne M. Donovan (anned3005(AT)aol.com), Oct 20 2004
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