The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A104958 Primes from merging of 2 successive digits in decimal expansion of cos(1). 2
 23, 13, 97, 71, 17, 29, 97, 37, 73, 23, 31, 61, 17, 79, 67, 97, 53, 11, 47, 47, 71, 17, 17, 79, 71, 83, 89, 43, 71, 17, 73, 31, 11, 89, 97, 37, 41, 17, 73, 31, 47, 71, 17, 79, 97, 71, 11, 47, 47, 79, 23, 31, 11, 17, 79, 13, 43, 59, 43, 17, 67, 89, 59, 37, 73, 61, 43, 41, 17 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Leading zeros are not permitted, i.e., all terms must be two digits in length. - Harvey P. Dale, Apr 20 2012 The last of the 21 2-digit primes to appear is a(233) = 19. - Charles R Greathouse IV, May 13 2019 LINKS Harvey P. Dale and Vincenzo Librandi, Table of n, a(n) for n = 1..1001 The first 15,000 digits of Cos(1) as calculated by Simon Plouffe at WorldWideSchool.org. Eric Weisstein's World of Mathematics, Cosine Function MATHEMATICA Select[FromDigits/@Partition[RealDigits[Cos[1], 10, 400][[1]], 2, 1], PrimeQ[#]&&#>9&] (* Harvey P. Dale, Apr 20 2012 *) CROSSREFS Sequence in context: A070838 A199713 A064735 * A124601 A040508 A305943 Adjacent sequences:  A104955 A104956 A104957 * A104959 A104960 A104961 KEYWORD nonn,base AUTHOR Andrew G. West (WestA(AT)wlu.edu), Mar 30 2005 EXTENSIONS Offset changed from 0 to 1 by Vincenzo Librandi, Apr 28 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 16 04:49 EDT 2021. Contains 343030 sequences. (Running on oeis4.)