The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A277137 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A277137

Numbers k such that cos(k) > 0 and cos(k+2) < 0.
(history; published version)

#13 by Harvey P. Dale at Fri Jan 26 23:53:26 EST 2018

STATUS

editing

approved

#12 by Harvey P. Dale at Fri Jan 26 23:53:22 EST 2018

MATHEMATICA

Position[Partition[Table[Cos[n], {n, 200}], 3, 1], _?(#[[1]]>0&&#[[3]]<0&), 1, Heads->False]//Flatten (* Harvey P. Dale, Jan 26 2018 *)

STATUS

approved

editing

#11 by Michel Marcus at Sun Oct 16 09:47:05 EDT 2016

STATUS

reviewed

approved

#10 by Joerg Arndt at Sun Oct 16 09:33:47 EDT 2016

STATUS

proposed

reviewed

#9 by Clark Kimberling at Sun Oct 16 08:21:29 EDT 2016

STATUS

editing

proposed

#8 by Clark Kimberling at Sun Oct 16 08:16:33 EDT 2016

CROSSREFS

Cf. A277136, A277138, A277139, subsequence of A131503.

STATUS

reviewed

editing

#7 by Michel Marcus at Sat Oct 15 10:26:47 EDT 2016

STATUS

proposed

reviewed

Discussion

Sat Oct 15

10:30

Michel Marcus: Subsequence of A131503 ...

#6 by Felix Fröhlich at Fri Oct 14 09:11:20 EDT 2016

STATUS

editing

proposed

#5 by Felix Fröhlich at Fri Oct 14 09:10:53 EDT 2016

PROG

(PARI) is(n) = cos(n) > 0 && cos(n+2) < 0 \\ Felix Fröhlich, Oct 14 2016

STATUS

proposed

editing

#4 by Clark Kimberling at Fri Oct 14 08:53:31 EDT 2016

STATUS

editing

proposed