If today is Sunday, what day is 10 ^ 99 days later? The answer is Sunday, Quick algorithm without calculator

The remainder is 6, because the decimal of 1 / 7 circulates according to 142857. The corresponding remainder of 10, 100, 1000, 10000, 100000 and 1000000 divided by 7 is 3, 2, 6, 4, 5 and 1, that is, every 10 ^ 6, the remainder circulates. 99 divided by 6, the remainder is 3, and the corresponding remainder divided by 7 should be the third one listed above, which is 6

RELATED INFORMATIONS

1. Today is Tuesday. What day is it in 100 days?
2. Today is Saturday, another 50 days is Sunday () A. One B. day C. six D. five
3. Today is Sunday. What day is it in a hundred days?
4. Quick, urgent. Today is Wednesday, after the power of 2013, what day is it We have to find a way,
5. If today is Sunday, do you know what day is the 2012 power of 2? What about the 2013 power of 3? Ask for advice
6. Today is Tuesday. What's the week after the power of 3?
7. Today is Thursday, the 80th time in 79 days. What day is it?
8. Today is Sunday. If tomorrow is the first day, what day is 1 ^ 3 + 2 ^ 3 + 3 ^ 3 +. + 1998 ^ 3?
9. Today is Sunday, if tomorrow is the first day, then 1 ^ 3 + 2 ^ 3 + 3 ^ 3 +. + 2002 ^ 3 is Sunday (1) Today is Sunday. If tomorrow is the first day, what day is the first ^ 3 + 2 ^ 3 + 3 ^ 3 +. + 2002 ^ 3 day? (2) Fold a rectangular piece of paper in half to get a crease. Continue to fold it in half. When folding in half, each crease is parallel to the last one. How many creases are there after 4 consecutive folds? 10 folds? N folds? The second question no, found, the first question which expert help ah~~~~~~~~~~
10. Today is Sunday, if tomorrow is the first day, then the 20033-20023 + 20013-20003 + -23 + 13 days is a week______ ．
11. Today is Thursday. What day is the 15th power of 365?
12. Today is Saturday. What day is it after the 100th power of 10?
13. Today is Friday. What's the day of 1996 in three days? There's another question. What's the day of 1996 in two days? It's urgent
14. Today is Friday. What day is the 364th power of 365
15. If today is Friday, what's the day of the ninth power after the ninth power from today?
16. Today is Friday, 97 times the power of 97, what day is it?
17. Today is Friday. What day is the 112th power of 211
18. Today is Wednesday. What day is it in five hundred days?
19. Today is Wednesday. After 99 days, it's ()
20. Suppose today is Sunday, and 75 days later, what day is the week