login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A052087 Primes whose decimal expansion is a concatenation of two or more consecutive increasing numbers (no leading zeros allowed). 15
23, 67, 89, 1213, 3637, 4243, 4567, 5051, 5657, 6263, 6869, 7879, 8081, 9091, 9293, 9697, 102103, 108109, 120121, 126127, 138139, 150151, 156157, 180181, 186187, 188189, 192193, 200201, 216217, 242243, 246247, 252253, 270271 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Paul Tek, Table of n, a(n) for n = 1..10000

MATHEMATICA

With[{e = 6}, TakeWhile[Select[Function[s, Union@ Flatten@ Map[Function[k, Map[FromDigits@ Flatten@ IntegerDigits@ # &, Partition[Take[s, 10^(e - k)], k, 1]]], Range[2, e]]]@ Range[10^e], PrimeQ], IntegerLength@ # <= e &]] (* Michael De Vlieger, Apr 23 2017 *)

CROSSREFS

Cf. A052088, A030458, A052089.

Primes in A035333.

Sequence in context: A125873 A059241 A241212 * A030458 A053559 A322414

Adjacent sequences:  A052084 A052085 A052086 * A052088 A052089 A052090

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Jan 15 2000

EXTENSIONS

Initial data corrected by Paul Tek, May 07 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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 23:23 EDT 2019. Contains 328379 sequences. (Running on oeis4.)