Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A031979
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A031979 Smallest digit of n concatenated with largest digit of n is prime. +0
2
11, 13, 17, 19, 20, 23, 29, 30, 31, 32, 37, 47, 50, 59, 67, 70, 71, 73, 74, 76, 79, 89, 91, 92, 95, 97, 98, 102, 103, 105, 107, 111, 113, 117, 119, 120, 123, 127, 129, 130, 131, 132, 133, 137, 139, 147, 149, 150, 157, 159, 167, 169, 170, 171, 172, 173, 174, 175 (list; graph; listen)
OFFSET

1,1

EXAMPLE

a(5)=20 because 2 is prime. a(1300)=3295 because 29 is prime.

CROSSREFS

Cf. A054054, A054055.

Sequence in context: A099481 A068569 A124176 this_sequence A055239 A138708 A061116

Adjacent sequences: A031976 A031977 A031978 this_sequence A031980 A031981 A031982

KEYWORD

base,nonn

AUTHOR

Jason Earls (zevi_35711(AT)yahoo.com), Jun 25 2003

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.


AT&T Labs Research