perplexus.info :: Numbers : Arithmetic prime

Arithmetic prime (Posted on 2019-04-25)

What is the smallest positive integer k such that k+1, 2k+1, 3k+1, 4k+1 are all primes?

No Solution Yet Submitted by Danish Ahmed Khan

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Subject	Author	Date
Puzzle Answer	K Sengupta	2022-06-04 00:31:40
re: computer solution - OEIS findings	Brian Smith	2019-04-26 01:21:09
computer solution	Charlie	2019-04-25 14:50:25

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