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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A175248 Noncomposites (A008578) with noncomposite (A008578) subscripts.

Original entry on oeis.org

1, 2, 3, 7, 13, 29, 37, 53, 61, 79, 107, 113, 151, 173, 181, 199, 239, 271, 281, 317, 349, 359, 397, 421, 457, 503, 541, 557, 577, 593, 613, 701, 733, 769, 787, 857, 863, 911, 953, 983, 1021, 1061, 1069, 1151, 1163, 1193, 1213, 1291, 1399, 1429, 1439, 1459
Offset: 1

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Author

Jaroslav Krizek, Mar 13 2010

Keywords

Comments

Noncomposite numbers of order 2.
a(n) = noncomposite(noncomposite(n)) = A008578(A008578(n)). a(1) = 1, a(n) = A055003(n) for n >=2. a(n) U A175249(n+1) = A008578 for n >= 1.

Examples

			a(5) = 13 because a(5) = q(q(5)) = q(7) = 13, q = noncomposite.

Crossrefs

Cf. A006450, A102615.

Formula

a(n)=A008578(A008578(n)).

Extensions

More terms from Juri-Stepan Gerasimov, Apr 15 2010
Edited by N. J. A. Sloane, Apr 21 2010 at the suggestion of R. J. Mathar
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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