Tanabata is also called "fasting seven", "managing seven", "burning seven", "traveling seven", "traveling one day" and "traveling seven". The old funeral customs of the Han nationality are very popular all over the country. On July 7th, that is, after the death (or after the funeral), a coffin seat was set up from the "first seven days" for the wood owner to cry and worship every day, and a Buddhist ceremony was held every seven days, and a fasting memorial service was set up, which ended on the 49th day of July 7th.

Every 7 days is a cycle, and 7749 days is 7*7=49. So 7749 days is 49 days.

Extended data:

7749 is also a multiplication formula.

The 99-99 multiplication melody is also often called "Little 99". The formula for students to learn "elementary ninety-nine" is from "11" to "998 1", but in ancient times, it was the other way around, from "998 1" to "11". Because the first two words of the formula are "99", people call it "99" for short. It was not until 13 and 14 centuries that it became our 99-99 formula "one by one?" 998 1 ".Song formula is as follows:

One by one.

One, two, two, two, four.

One, three, two, three, six, three, three and nine.

Fourteen is four, two, four, eight, three, four, twelve, four, forty-six.

15 is 525, 135, 1525, 4525525.

16 is 62, 62, 38, 46, 24, 56, 36, 636.

Obtained .51989.99999998985

18 get 82 86 384 48312 584 68418 78516 8864.

1992 983927 4936 594 15 6954 796 13 8972 998 1

References:

Baidu encyclopedia-Qiqi

References:

Baidu encyclopedia-multiplication formula