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A105300
Primes formed by reverse concatenation of 8 consecutive triangular numbers.
0
1178111628114761132511175110261087810731, 779376778128776881775635774390773146771903770661, 852165850860849556848253846951845650844350843051
OFFSET
1,1
EXAMPLE
a(1)=1178111628114761132511175110261087810731 because 1178111628114761132511175110261087810731 is the prime formed by reverse concatenation of 8 consecutive triangular numbers i.e. 10731,10878,11026,11175,11325,11476,11628 and 11781.
MATHEMATICA
Select[FromDigits[Flatten[(IntegerDigits/@Reverse[#])]]&/@Partition[ Accumulate[ Range[ 2000]], 8, 1], PrimeQ] (* Harvey P. Dale, Mar 01 2023 *)
CROSSREFS
Sequence in context: A329659 A336775 A095472 * A292992 A375648 A008870
KEYWORD
base,nonn,bref
AUTHOR
Shyam Sunder Gupta, Apr 25 2005
STATUS
approved