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 A189559 Least prime k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x. 3
 2, 5, 31, 167, 151, 491, 983, 887, 311, 1151, 1559, 2111, 1031, 2711, 4391, 4271, 3671, 3191, 5351, 9551, 11471, 14759, 8951, 13751, 11831, 5591, 19991, 10391, 15791, 28031, 30071, 37511, 43151, 27191, 40031, 31391, 52631, 53231, 35591, 52391, 50951 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS It is much easier finding composite numbers having many solutions. See A189558. For odd numbers, see A189560. REFERENCES See A003415. LINKS Donovan Johnson, Table of n, a(n) for n = 0..200 FORMULA a(n) is the least prime k such that A099302(k) = n. CROSSREFS Cf. A003415, A099302, A189558, A189560. Sequence in context: A266478 A107389 A261750 * A077483 A119242 A068145 Adjacent sequences: A189556 A189557 A189558 * A189560 A189561 A189562 KEYWORD nonn AUTHOR T. D. Noe, Apr 24 2011 STATUS approved

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Last modified July 15 19:27 EDT 2024. Contains 374334 sequences. (Running on oeis4.)