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Subtract 1 from the terms of A256407.
2

%I #9 Apr 13 2015 15:01:49

%S 2,197,269,521,569,599,821,881,1061,1949,2129,2267,2309,2591,2969,

%T 3167,5021,5501,6701,7349,9437,10037,10427,10499,14009,14561,15287,

%U 16649,17027,17957,18059,18521,19697,19889,20549,20717,20771,22157,22637,23057,23561,24107,25169

%N Subtract 1 from the terms of A256407.

%C Conjectured to be always a prime. But which primes are these? It would be nice to know of some other property that distinguishes these primes. See also the "blog" in A166133.

%H Ray Chandler, <a href="/A256410/b256410.txt">Table of n, a(n) for n = 1..3258</a>

%Y Cf. A166133, A256403-A256409.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Apr 03 2015