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A366604
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Number of distinct prime divisors of 4^n - 1.
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10
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1, 2, 2, 3, 3, 4, 3, 4, 4, 5, 4, 6, 3, 6, 6, 5, 3, 8, 3, 7, 6, 7, 4, 9, 7, 7, 6, 8, 6, 11, 3, 7, 8, 7, 9, 12, 5, 7, 7, 9, 5, 12, 5, 10, 11, 9, 6, 12, 5, 12, 10, 10, 6, 12, 11, 11, 8, 9, 6, 15, 3, 8, 11, 9, 9, 14, 5, 10, 8, 15, 6, 17, 6, 10, 13, 11, 10, 16, 5
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OFFSET
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1,2
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) for(n = 1, 100, print1(omega(4^n - 1), ", "))
(Python)
from sympy import primenu
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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