

A111674


a(1) = 1; for n>1, a(n) = least multiple of a(n1) such that the termwise concatenation of a(n), a(n1),...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
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OFFSET

1,2


LINKS

Diana Mecum, Table of n, a(n) for n = 1..41


EXAMPLE

31,331,15331,7515331, ... are all primes.


CROSSREFS

Cf. A111675.
Sequence in context: A143257 A089403 A239600 * A222505 A292356 A209020
Adjacent sequences: A111671 A111672 A111673 * A111675 A111676 A111677


KEYWORD

base,nonn


AUTHOR

Amarnath Murthy, Aug 15 2005


EXTENSIONS

More terms from Diana L. Mecum, Jun 26 2007


STATUS

approved



