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A111674
a(1) = 1; for n>1, a(n) = least multiple of a(n-1) such that the termwise concatenation of a(n), a(n-1),...a(2), a(1) is prime.
2
1, 3, 3, 15, 75, 525, 7875, 126000, 2520000, 30240000, 151200000, 5594400000, 341258400000, 21840537600000, 1310432256000000, 23587780608000000, 1533205739520000000, 222314832230400000000, 20452964565196800000000
OFFSET
1,2
LINKS
EXAMPLE
31,331,15331,7515331, ... are all primes.
CROSSREFS
Cf. A111675.
Sequence in context: A143257 A089403 A239600 * A222505 A292356 A370869
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Aug 15 2005
EXTENSIONS
More terms from Diana L. Mecum, Jun 26 2007
STATUS
approved