login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A069679 Primes with either no internal digits or all internal digits are 4. 9

%I #21 Jul 23 2023 01:50:10

%S 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,

%T 97,149,241,347,349,443,449,541,547,641,643,647,743,941,947,1447,2441,

%U 2447,3449,4441,4447,5441,5443,5449,6449,8443,8447,14447,14449,24443,44449

%N Primes with either no internal digits or all internal digits are 4.

%H Harvey P. Dale, <a href="/A069679/b069679.txt">Table of n, a(n) for n = 1..77</a> (all terms up to the one millionth prime)

%t Join[Prime[Range[25]],Select[Prime[Range[26,5000]],Union[Most[Rest[ IntegerDigits[ #]]]] =={4}&]] (* _Harvey P. Dale_, Dec 08 2022 *)

%Y Cf. A069675, A069676, A069677, A069678, A069680, A069681, A069682, A069683, A069684.

%K nonn,base

%O 1,1

%A _Amarnath Murthy_, Apr 06 2002

%E Corrected by _Ray Chandler_, Nov 24 2003

%E Offset corrected and name changed by _Arkadiusz Wesolowski_, Sep 07 2011

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)