The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A073834 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A073834

Denominators of b(n) where b(1) = 1, b(i) = b(i-1) + 1/b(i-1).
(history; published version)

#22 by Michael De Vlieger at Fri May 06 07:37:09 EDT 2022

STATUS

proposed

approved

#21 by Eric W. Weisstein at Fri May 06 07:34:58 EDT 2022

STATUS

editing

proposed

#20 by Eric W. Weisstein at Fri May 06 07:34:57 EDT 2022

LINKS

Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/MycielskiGraph.html">Mycielski Graph</a>

STATUS

approved

editing

#19 by N. J. A. Sloane at Tue Aug 18 15:45:28 EDT 2020

STATUS

editing

approved

#18 by N. J. A. Sloane at Tue Aug 18 15:45:26 EDT 2020

AUTHOR

_Alex Fink (finks(AT)telus.net), _, Aug 12 2002

STATUS

approved

editing

#17 by Charles R Greathouse IV at Wed Apr 30 01:34:06 EDT 2014

PROG

(PARI) {a(n) = local(x, y); if( n<1, 0, if( n<3, n, x = a(n-2)^2; y = a(n-1); y*y + x * (y - x)))} /* _Michael Somos, _, Mar 05 2012 */

Discussion

Wed Apr 30

01:34

OEIS Server: https://oeis.org/edit/global/2177

#16 by Russ Cox at Sat Mar 31 21:03:44 EDT 2012

MATHEMATICA

Denominator[NestList[# + 1/# &, 1, 10]] (* _Eric W. Weisstein (eric(AT)weisstin.com), _, Mar 05 2011 *)

Discussion

Sat Mar 31

21:03

OEIS Server: https://oeis.org/edit/global/1338

#15 by Russ Cox at Fri Mar 30 18:52:13 EDT 2012

MATHEMATICA

f[n_]:=n+1/n; Prepend[Denominator[NestList[f, 2, 9]], 1] (* _Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), _, Nov 19 2010 *)

Discussion

Fri Mar 30

18:52

OEIS Server: https://oeis.org/edit/global/254

#14 by Russ Cox at Fri Mar 30 17:35:11 EDT 2012

COMMENTS

a(n) is also the denominator of the fractional chromatic number of the Mycielski graph M_n - _Eric W. Weisstein (eric(AT)weisstein.com), _, Mar 05 2011

Discussion

Fri Mar 30

17:35

OEIS Server: https://oeis.org/edit/global/166

#13 by T. D. Noe at Mon Mar 05 17:38:12 EST 2012

STATUS

proposed

approved