The ghosts of Eratosthenes and Euclid are playing hide and seek. They can hide anywhere in all of space and time, but the pair are in agreement to play somewhere on earth within the years 0 to 2000. Eratosthenes just found Euclid so now it's Eratosthenes's turn to hide. He scrawls out a note, hands it to Euclid and POOF! -- he spirits himself away to the hiding place. Dumbfounded, Euclid brings the note to you for help. The note reads:
826579 cbaa .
72037312757471 cfbeadbg :
In what day, and what place, is Eratosthenes probably hiding?
The names are hints towards the same feature of this puzzle
This riddle would be solvable without the letters, but it would be a bit harder
Think harder about i=29. What's special about 29?
The second part is encrypted slightly differently to throw you off. The row following the colon represents two quantities, with which you can do what the puzzle tells you to do.