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 A160513 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). 1
 1, 2, 3, 7, 17, 19 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Is this sequence complete? 1 here is considered to be both the first squarefree integer and the first power of a prime. LINKS Shawn A. Broyles, Lua script EXAMPLE If A005117(m) and A000961(m) are the same, a(n) is the m-th term. For m = 1, A005117(m) and A000961(m) are both 1. a(1) = 1. For m = 2, A005117(m) and A000961(m) are both 2. a(2) = 2. For m = 3, A005117(m) and A000961(m) are both 3. a(3) = 3. For m = 6, A005117(m) and A000961(m) are both 7. a(4) = 7. For m = 12, A005117(m) and A000961(m) are both 17. a(5) = 17. For m = 13, A005117(m) and A000961(m) are both 19. a(6) = 19. CROSSREFS Cf. A000961, A005117. Sequence in context: A141795 A077322 A174359 * A154431 A256917 A089144 Adjacent sequences:  A160510 A160511 A160512 * A160514 A160515 A160516 KEYWORD fini,more,nonn AUTHOR Leroy Quet, May 16 2009 EXTENSIONS Definition rewritten by N. J. A. Sloane, May 21 2009 STATUS approved

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Last modified April 9 01:33 EDT 2020. Contains 333339 sequences. (Running on oeis4.)