perplexus.info :: Sequences : Semiprimes in Arithmetic Sequence

Semiprimes in Arithmetic Sequence (Posted on 2022-11-20)

30 semiprimes, each less than 10⁸, form an arithmetic sequence with strictly positive common difference.

Determine all of them.

Note: A semiprime is the product of exactly two primes.

*** For an extra challenge only, find a semi-analytic solution (simple calculator + p&p) to this puzzle.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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

Subject	Author	Date
No Subject	K Sengupta	2022-11-30 00:41:44
No Subject	K Sengupta	2022-11-29 22:16:40
Peter	Peter Bately	2022-11-29 06:48:51
other references found online	Steven Lord	2022-11-28 20:54:35
A different approach	Steven Lord	2022-11-26 22:43:31
solution	Steven Lord	2022-11-22 13:17:14
a study I found n the literature	Steven Lord	2022-11-21 03:04:19
Really?	broll	2022-11-20 23:43:53
If at first...	broll	2022-11-20 22:53:33
No Subject	broll	2022-11-20 22:42:28
a failed attempt	Charlie	2022-11-20 11:07:03

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