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%I #19 Nov 27 2017 03:21:34
%S 1,2,3,7,17,19
%N Positive squarefree integers n such that, if n is the m-th squarefree integer (i.e., the m-th term of A005117), then n is also the m-th term of A000961 (the prime powers).
%C Is this sequence complete?
%C 1 here is considered to be both the first squarefree integer and the first power of a prime.
%H Shawn A. Broyles, <a href="/A160513/a160513.txt">Lua script</a>
%e If A005117(m) and A000961(m) are the same, a(n) is the m-th term.
%e For m = 1, A005117(m) and A000961(m) are both 1. a(1) = 1.
%e For m = 2, A005117(m) and A000961(m) are both 2. a(2) = 2.
%e For m = 3, A005117(m) and A000961(m) are both 3. a(3) = 3.
%e For m = 6, A005117(m) and A000961(m) are both 7. a(4) = 7.
%e For m = 12, A005117(m) and A000961(m) are both 17. a(5) = 17.
%e For m = 13, A005117(m) and A000961(m) are both 19. a(6) = 19.
%Y Cf. A000961, A005117.
%K fini,more,nonn
%O 1,2
%A _Leroy Quet_, May 16 2009
%E Definition rewritten by _N. J. A. Sloane_, May 21 2009
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