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 A216105 [7^(5*10^(n+1)) mod 10^(2n+3) - 1]/(10^(2n+2)) mod 10. 1

%I

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

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

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

%N [7^(5*10^(n+1)) mod 10^(2n+3) - 1]/(10^(2n+2)) mod 10.

%C 7^500 ends in 64030001

%C 7^5000 ends in 5640300001

%C 7^50000 ends in 756403000001

%C 7^500000 ends in 77564030000001

%C The last digits before the zeros tend to converge to the present sequence.

%Y Cf. A007185, A016090, A091663, A018248, A091664, A018247, A216104.

%K nonn,base

%O 1,1

%A _V. Raman_, Sep 02 2012

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Last modified May 16 12:25 EDT 2021. Contains 343947 sequences. (Running on oeis4.)