perplexus.info :: Numbers : Semiprime times

Semiprime times (Posted on 2023-01-29)

2:21 is a semiprime time as 221 is a semiprime number, since 221 is the product of the prime numbers 13 and 17.

Determine the total number of semiprime times in 12 hours.
Determine the total number of semiprime times in 24 hours.

Notes:
• A definition of semiprime is provided in this location.
• Thanks go to Math Man for inspiring this puzzle.

Submitted by K Sengupta

Rating: 5.0000 (1 votes)

Solution: (Hide)

1. The total number of semiprime times in 12 hours is 210.
2. The total number of semiprime times in 24 hours is 414.
For an explanation, refer to the computer program assisted solution submitted by Charlie in this location.

Comments: ( You must be logged in to post comments.)

	Subject	Author	Date
	computer solution	Charlie	2023-01-29 12:12:17

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