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A111674
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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.
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2
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1, 3, 3, 15, 75, 525, 7875, 126000, 2520000, 30240000, 151200000, 5594400000, 341258400000, 21840537600000, 1310432256000000, 23587780608000000, 1533205739520000000, 222314832230400000000, 20452964565196800000000
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OFFSET
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1,2
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LINKS
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EXAMPLE
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31,331,15331,7515331, ... are all primes.
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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