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A371129
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Integers m whose (constant) convergence speed is exactly 3 (i.e., m^^(m+1) has 3 more rightmost frozen digits than m^^m, where ^^ indicates tetration).
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2
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25, 55, 57, 68, 105, 124, 126, 135, 185, 193, 215, 249, 265, 295, 318, 345, 374, 375, 376, 425, 432, 455, 505, 535, 568, 585, 615, 665, 682, 695, 745, 751, 775, 807, 818, 825, 855, 874, 876, 905, 932, 935, 943, 985, 999, 1001, 1015, 1057, 1065, 1095, 1124
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OFFSET
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1,1
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COMMENTS
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It is well known (see Links) that as the hyperexponent of the integer m becomes sufficiently large, the constant convergence speed of m is the number of new stable digits that appear at the end of the result for any further unit increment of the hyperexponent itself, and a sufficient (but not necessary) condition to get this fixed value is to set the hyperexponent equal to m plus 1 (e.g., if n := 3, m = 57 and so 57^^58 has exactly 3 more stable digits at the end of the result than 57^^57).
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LINKS
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FORMULA
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a(n) is such that A317905(m) = 3, for m = 25, 26, 27, ...
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EXAMPLE
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If n = 3, m = 57 and so 57^^58 has exactly 3 more stable digits at the end of the result than 57^^57.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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