What is the modular representation of an integer using a set of primes?
More specifically, a problem on my homework asks to convert 49 to a modular representation using primes 7,11,13,17.
Would appreciate a general solution.
Your textbook surely states what they mean by the phrase.
But to take a guess, they're probably referring to a "residue number system", where you represent not-too-large integers as a sequence of residue classes modulo a set of moduli (usually primes).
(to do the reverse conversion, from the residue number system to decimal (or other representations) typically involves the Chinese Remainder Theorem)