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A225441 10-adic integer x such that x^7 == 7*(10^n-1)/9 mod 10^n for all n. 1
3, 3, 6, 5, 9, 8, 0, 3, 1, 9, 2, 2, 9, 2, 4, 9, 3, 1, 3, 9, 4, 0, 7, 4, 3, 6, 7, 8, 6, 4, 6, 8, 1, 7, 7, 1, 3, 8, 8, 0, 1, 7, 8, 4, 6, 0, 3, 0, 1, 0, 0, 2, 8, 0, 2, 4, 3, 4, 8, 2, 9, 2, 3, 5, 5, 4, 1, 3, 5, 3, 1, 0, 7, 0, 1, 1, 6, 7, 9, 9, 8, 1, 7, 2, 0, 8, 4, 1, 3, 1, 7, 4, 3, 5, 3, 7, 0, 6, 4, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..100.

EXAMPLE

3^7 == 7 (mod 10).

33^7 == 77 (mod 100).

633^7 == 777 (mod 1000).

5633^7 == 7777 (mod 10000).

95633^7 == 77777 (mod 100000).

895633^7 == 777777 (mod 1000000).

PROG

(PARI) n=0; for(i=1, 100, m=7*(10^i-1)/9; for(x=0, 9, if(((n+(x*10^(i-1)))^7)%(10^i)==m, n=n+(x*10^(i-1)); print1(x", "); break)))

CROSSREFS

Sequence in context: A280167 A257143 A080512 * A102245 A038167 A131077

Adjacent sequences:  A225438 A225439 A225440 * A225442 A225443 A225444

KEYWORD

nonn,base

AUTHOR

Aswini Vaidyanathan, May 11 2013

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)