15997492271
This number is a composite.
1 5997492271
The smallest semiprime that is
product of two primes whose concatenation (in some order)
produces the decimal expansion of Golden Ratio, e.g.,
15997492271 = 1618033*9887. The sequence begins:
15997492271, 144005024998661,
1447894809792516806164432719667990034803441,
14478948097925168061644327196682809665374118060693, ... . [Bajpai]
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