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A088143 Find the shortest prefix of Pi-3 = .141592653589793238462643383279502.. which is divisible by n and divide by n. 1

%I #13 Sep 19 2019 22:42:35

%S 1,7,47,35398,283,23598775598298873,2,17699,15732517,

%T 1415926535897932384626433832795,12872,

%U 117993877991494365385536152732919,1089174258383,1,943951,88495408493620774,8328979622929,7866258532766291,7452244925778591498

%N Find the shortest prefix of Pi-3 = .141592653589793238462643383279502.. which is divisible by n and divide by n.

%C a(152) has 1218 digits, so is too large for a b-file. - _Robert Israel_, Sep 19 2019

%H Robert Israel, <a href="/A088143/b088143.txt">Table of n, a(n) for n = 1..151</a>

%e 1/1 = 1, 14/2 = 7, 141/3 = 47, 141592/4 = 35398, 1415/5 = 283,...

%p F:= floor((Pi-3)*10^10000):

%p Prefs:= [seq(floor(F/10^(10000-i)),i=1..10000)]:

%p f:= proc(n) local i;

%p for i from 1 to nops(Prefs) do if Prefs[i] mod n = 0 then return Prefs[i]/n fi od:

%p FAIL

%p end proc:

%p map(f, [$1..151]); # _Robert Israel_, Sep 19 2019

%Y Cf. A000796.

%K base,nonn

%O 1,2

%A _N. J. A. Sloane_, Nov 03 2003

%E Corrected and extended by _Ray Chandler_ and _Vladeta Jovovic_, Nov 06 2003

%E Name corrected by _Robert Israel_, Sep 19 2019

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Last modified April 24 05:47 EDT 2024. Contains 371918 sequences. (Running on oeis4.)