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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 60th year, we have over 367,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A105293 Smallest prime formed by reverse concatenation of n consecutive triangular numbers, 0 if no such prime exists. 0
 3, 31, 631, 10631, 19531891183017701711, 665545362821, 7140702169036786667065556441, 1178111628114761132511175110261087810731, 0, 55453628211510631 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..10. EXAMPLE a(3)=631 because 631 is the smallest prime formed by reverse concatenation of 3 consecutive triangular numbers i.e. 1,3 and 6. CROSSREFS Sequence in context: A229258 A319896 A222895 * A104841 A092552 A322487 Adjacent sequences: A105290 A105291 A105292 * A105294 A105295 A105296 KEYWORD base,nonn AUTHOR Shyam Sunder Gupta, Apr 25 2005 STATUS approved

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.

Last modified December 5 19:03 EST 2023. Contains 367593 sequences. (Running on oeis4.)