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 A104866 Initial and final digits in the partition of decimal expansion of Pi. 7

%I

%S 3,5,0,5,9,9,8,0,6,4,4,0,2,7,5,9,0,3,2,1,4,5,5,2,0,9,2,0,9,5,3,8,5,6,

%T 7,3,7,7,1,7,5,1,2,6,0,9,0,1,0,7,9,2,3,4,1,5,1,1,0,9,5,9,0,2,5,3,4,6,

%U 1,1,7,8,7,5,9,0,5,9,2,0,9,3,3,0,1,8,9,5,9,4,9,1,5,5,7,2,5,0,4,8

%N Initial and final digits in the partition of decimal expansion of Pi.

%C Start with decimal expansion of pi: s0=3,1,4,1,5,9,2,6,5,3,5,8,9,7,9,3,2,3,8,4,6,2,6,4,3,3,8,3,2,7,9,5,0,2,8,8,4,1,9,7,1,6,9,3,9,9,3,7,5,1,0,5,8,2,0,9,7,4,9,4,4,5,... Divide s0 to the sections with the same final digits: s={3,1,4,1,5,9,2,6,5,3}, {5,8,9,7,9,3,2,3,8,4,6,2,6,4,3,3,8,3,2,7,9,5}, {0,2,8,8,4,1,9,7,1,6,9,3,9,9,3,7,5,1,0}, {5,8,2,0,9,7,4,9,4,4,5},... Then A104865(n) = length of s(n): 10,22,19,11,... A104866(n) = initial/final digits of s(n): 3,5,0,5,...

%Y Cf. A104865, A104867, A104868, A104869, A104870, A104871.

%K nonn,base

%O 1,1

%A _Zak Seidov_, Mar 29 2005

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Last modified July 20 16:15 EDT 2019. Contains 325185 sequences. (Running on oeis4.)