"Vestanam," which means "By Osculation," is a powerful technique for divisibility tests, especially for prime numbers. It allows us to break down a large number into a smaller one that's easier to check.
The term Vestanam relates to "osculation" or "kissing". In mathematics, it refers to the point of contact or tangency. Swami Bharati Krishna Tirtha used this term to describe a method where digits "touch" or influence the rest of the number to reveal divisibility.
To test divisibility, we repeatedly multiply the last digit of our number by a special number (the "osculator") and add/subtract it from the rest of the number.
Enter a number and a divisor (ending in 1, 3, 7, or 9) to test for divisibility.
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