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.

I pass this on only - I really don't know if it helps... I was worried it gave away the answer :-)

Posted by Steven Lord on 2022-11-21 03:04:19