Numbers 770,000s

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770,884

[Math.]  (121+878 = 999 = 101+898)

1212 = 014,641 & 014+641 = 655

8782 = 770,884 & 770+884 = 1654 and 1+654 = 655.

and

1012 = 010,201 & 010+201 = 211

8982 = 806,404 & 806+404 = 1210 and 1+210 = 211.

 

776,887

[Math.] A prime number: 776,887 = 77–66.

 

777,787 & 777,877 & 778777

[Math.] All 4 numbers 777,787, 777,877, 778,777 and 787,777 (1 digit off repeated digits) are all prime numbers.