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Partial sums of A180405.
2

%I #23 Jun 06 2023 08:17:47

%S 2,3,7,13,16,23,31,41,52,67,79,97,111,127,149,173,192,223,251,271,294,

%T 331,367,397,423,457,486,521,563,601,641,673,712,757,809,853,907,953,

%U 1009,1069,1112,1163,1213,1277,1361,1409,1458,1511,1579,1637,1699,1777,1847,1913,1970

%N Partial sums of A180405.

%C The construction in A180405 means that if n is in A180405, then a(n) is prime. It seems that the converse is also true: if a(n) here is prime, then n is in A180405.

%C Indices of composite terms are given by A363379.

%H Neal Gersh Tolunsky, <a href="/A363450/b363450.txt">Table of n, a(n) for n = 1..10000</a>

%H Neal Gersh Tolunsky, <a href="/A363450/a363450.png">Graph of first 36568 terms</a>

%Y Cf. A180405, A363379.

%K nonn,easy

%O 1,1

%A _Neal Gersh Tolunsky_, Jun 02 2023