Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A089182
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A089182 Overlapping prime-based palindromic sequence. +0
2
2, 22, 232, 2332, 23532, 235532, 2357532, 23577532, 235817532, 2358217532, 23582417532, 235824417532, 2358248417532, 23582488417532, 235824908417532, 2358249108417532, 23582491508417532, 235824915508417532 (list; graph; listen)
OFFSET

2,1

COMMENT

Only the first 8 terms are truely palindromes: a modulo 10 version of this would work with a limited digit set of {0,1,2,3,5,7,9} with 2 and 5 always on the beginning and end.

FORMULA

a[m]=Delete[Table[If [ Floor[m/2]-n>=0, Prime[ n], Prime[m-n]], {n, 1, m}], m] b[m] = Sum[a[m][[i]]*10^(i-1), {i, 1, m-1}]

MATHEMATICA

a[m_]=Delete[Table[If [ Floor[m/2]-n>=0, Prime[ n], Prime[m-n]], {n, 1, m}], m] b=Table[Sum[a[m][[i]]*10^(i-1), {i, 1, m-1}], {m, 2, digits}]

CROSSREFS

Cf. A007907.

Sequence in context: A002276 A112893 A086855 this_sequence A138140 A082777 A036841

Adjacent sequences: A089179 A089180 A089181 this_sequence A089183 A089184 A089185

KEYWORD

nonn,base,uned

AUTHOR

Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Dec 07 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 August 19 23:53 EDT 2008. Contains 142930 sequences.


AT&T Labs Research