Smallest prime numbers n such that 2n+1, 4n+1, 8n+1, 10n+1, 14n+1 and 16n+1 are composite numbers.
197, 223, 227, 229, 257, 263, 283, 311, 317, 379, 383, 389, 457, 461, 463, 467, 521
3 seqfan posts
Tue Mar 30 20:38:01 CEST 2010 [seqfan] Re: mess and confusion
Tue Mar 30 20:00:02 CEST 2010 [seqfan] mess and confusion
Mon Mar 29 17:53:45 CEST 2010 [seqfan] Re: Help me understand these sequences
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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