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!)
A053586 Primes formed by concatenating n consecutive decreasing numbers starting with a prime p(n) and ending with the previous prime p(n-1). 1

%I #8 May 12 2022 18:16:49

%S 89888786858483,211210209208207206205204203202201200199,

%T 593592591590589588587,1327132613251324132313221321,

%U 2377237623752374237323722371,2963296229612960295929582957

%N Primes formed by concatenating n consecutive decreasing numbers starting with a prime p(n) and ending with the previous prime p(n-1).

%H Harvey P. Dale, <a href="/A053586/b053586.txt">Table of n, a(n) for n = 1..3000</a>

%e 89888786858483 belongs to the sequence because it is a prime number obtained by concatenating all the consecutive decreasing numbers from 89 to 83 with the primes 89 and 83.

%t Select[FromDigits[Flatten[IntegerDigits/@Reverse[Range[#[[1]],#[[2]]]]]]&/@Partition[ Prime[ Range[500]],2,1],PrimeQ] (* _Harvey P. Dale_, May 12 2022 *)

%Y Cf. A053558.

%K base,nonn

%O 1,1

%A _Felice Russo_, Jan 19 2000

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 April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)