cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A178045 Numbers of semiprimes between consecutive even numbers that are not semiprimes.

Original entry on oeis.org

0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 3, 2, 0, 0, 1, 1, 1, 0, 1, 2, 1, 1, 0, 1, 0, 1, 1, 0, 1, 3, 0, 1, 3, 0, 0, 0, 0, 1, 0, 1, 0, 1, 2, 3, 0, 0, 1, 0, 2, 0, 0, 3, 2, 0, 0, 0, 1, 2, 1, 0, 1, 1, 0, 0, 0, 2, 0, 1, 1, 1, 0, 0, 1, 0, 0, 3, 2, 1, 0, 3, 3, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 2, 0, 1, 1, 1, 1, 0, 0, 1
Offset: 1

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Author

Juri-Stepan Gerasimov, May 18 2010

Keywords

Comments

Numbers of semiprimes between A176100(n) and A176100(n+1) where A176100 is twice the n-th nonprime numbers.

Examples

			a(1)=0 because 2*A141468(1)=0<2=2*A141468(2); a(2)=2 because 2*A141468(2)=2<4(semiprime)<6(semiprime)<8=2*A141468(3).
		

Crossrefs

Extensions

a(66) and a(67) corrected by R. J. Mathar, May 28 2010
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