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Numbers k such that 6k+1 is a term in A005471.
4

%I #5 Oct 30 2024 10:27:37

%S 1,2,3,6,13,16,23,27,52,58,101,118,146,156,177,188,248,261,331,426,

%T 443,552,591,716,853,926,1248,1336,1427,1521,1553,1651,1752,1963,2148,

%U 2502,2543,2753,2883,3016,3061,3152,3338,3433,3481,4083,4241,4511,4566,4846

%N Numbers k such that 6k+1 is a term in A005471.

%e k=1: 6k+1 = 7 = A005471(1).

%e k=2: 6k+1 = 13 = A005471(2).

%e k=3: 6k+1 = 19 = A005471(3).

%e k=6: 6k+1 = 37 = A005471(4).

%Y Cf. A005471 (primes of form k^2 + 3*k + 9).

%K nonn

%O 1,2

%A _Zak Seidov_, Mar 20 2010