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Indices of prime terms in A375564, and also the index where the n-th prime appears.
5

%I #16 Sep 27 2024 13:58:07

%S 2,3,8,9,18,19,20,21,40,41,42,43,44,45,84,85,86,87,88,89,90,91,92,162,

%T 163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,321,322,

%U 323,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,345,346,347,348,349,350,351,649,650,651

%N Indices of prime terms in A375564, and also the index where the n-th prime appears.

%C _Scott R. Shannon_ reports (see A375564) that in the first 100000 terms the primes in A375564 appear in their natural order. [This is true in general. - _N. J. A. Sloane_, Sep 27 2024]

%H N. J. A. Sloane, <a href="/A376191/b376191.txt">Table of n, a(n) for n = 1..393</a>

%e A375564 begins 1, 2, 3, 4, 6, 8, 10, 5, 7, 9, 12, 14, 16, 18, 15, 20, 22, 11, 13, 17, 19, ... and the first few primes are at indices 2, 3, 8, 9, 18, 19, 20, 21, ...

%Y Cf. A375564, A376189.

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Sep 25 2024