Formula for Sphenic Numbers?
Which Is the Product of Exactly Three Distinct Primes. the First Few Sphenic Numbers Are 30, 42, 66, 70, 78, 102, 105, 110, 114, .. . (Oeis A007304). How Do...
which is the product of exactly three distinct primes. The first few sphenic numbers are 30, 42, 66, 70, 78, 102, 105, 110, 114, ... (OEIS A007304).
How do you calculate Sphenic numbers?
Sphenic number can be checked by first generating the Least prime factor of numbers till n. Then we could simply divide the number by its least prime factor and then that number by its least prime factor, and so on and then check if the number has exactly 3 distinct prime factors.
How many factors does a Sphenic number have?
Sphenic numbers have precisely 8 divisors, namely: 1, the three distinct primes, three semiprimes (in which each of the distinct prime factors of the sphenic number is omitted) and the sphenic number itself; e.g. for 42: 1, 2, 3, 7, 21 (equals 3 times 7, 2 is omitted), 14 (equals 2 times 7, 3 is omitted), 6 (equals 2 ...
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