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

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, 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, 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

Offset

1,1

Comments

7^500 ends in 64030001

7^5000 ends in 5640300001

7^50000 ends in 756403000001

7^500000 ends in 77564030000001

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

Links

Table of n, a(n) for n=1..112.

Crossrefs

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

Sequence in context: A112256 A188720 A113792 * A197022 A112238 A111493

Adjacent sequences: A216102 A216103 A216104 * A216106 A216107 A216108

Keyword

nonn,base

Author

V. Raman, Sep 02 2012

Status

approved