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A186886
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Least number k having exactly n prime divisors and the Stern polynomial B(k,x) is irreducible.
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1
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OFFSET
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1,1
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COMMENTS
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Ulas and Ulas tabulate these values and conjecture 6.5, p.20, that a(n) exists for all n.
See A125184 for the Stern polynomials. See A186891 for n such that the Stern polynomial B_n(x) is irreducible.
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LINKS
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EXAMPLE
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a(1) = 2.
a(2) = 55 = 5 * 11.
a(3) = 665 = 5 * 7 * 19.
a(4) = 6545 = 5 * 7 * 11 * 17.
a(5) = 85085 = 5 * 7 * 11 * 13 * 17.
a(6) = 1616615 = 5 * 7 * 11 * 13 * 17 * 19.
a(7) = 37182145 = 5 * 7 * 11 * 13 * 17 * 19 * 23.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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