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Search: id:A061399
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| A061399 |
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Number of non-square-free integers between primes p(n) and p(n+1). |
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+0
4
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| 0, 1, 0, 2, 1, 1, 1, 1, 4, 0, 2, 1, 0, 2, 4, 2, 1, 2, 1, 1, 2, 2, 2, 3, 3, 0, 1, 1, 1, 7, 1, 3, 0, 4, 1, 3, 2, 1, 4, 2, 1, 3, 1, 1, 1, 4, 3, 2, 1, 1, 2, 1, 6, 2, 2, 2, 1, 3, 2, 0, 4, 6, 1, 1, 2, 4, 3, 5, 1, 3, 1, 4, 3, 3, 1, 3, 2, 1, 3, 3, 1, 4, 1, 1, 2, 2, 3, 2, 0, 1, 5, 3, 2, 3, 1, 3, 4, 1, 9, 1, 5, 2, 3, 0, 3
(list; graph; listen)
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OFFSET
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1,4
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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Between 113 and 127 the 7 numbers which are not square-free are as follows: are:{116,117,120,121,124,125,126}, so a(30)=7
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PROGRAM
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(PARI) { n=0; q=2; forprime (p=3, prime(1001), a=0; for (i=q+1, p-1, a+=!issquarefree(i)); write("b061399.txt", n++, " ", a); q=p ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 22 2009]
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CROSSREFS
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A005117, A013929.
Sequence in context: A039754 A062277 A118210 this_sequence A161856 A122944 A107688
Adjacent sequences: A061396 A061397 A061398 this_sequence A061400 A061401 A061402
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jun 07 2001
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