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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

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Last modified September 19 11:26 EDT 2019. Contains 327193 sequences. (Running on oeis4.)