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 A250215 Least k such that the n-th weak irregular prime (A250216(n)) divides A241601(k). 0
 11, 23, 32, 13, 15, 44, 7, 27, 29, 19, 63, 24, 22, 43, 129, 130, 62, 75, 133, 84, 211, 127, 164, 100, 84, 9, 20, 156, 88, 87, 280, 19, 71, 125 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A prime p can divide A241601(k) for more than one k; the first few examples are as follows: p      k 67     27, 58 101    63, 68 149    130, 147 157    62, 110 241    211, 239 263    100, 213 307    88, 91, 137 311    87, 193, 292 349    19, 257 353    71, 186, 300 etc. LINKS Eric Weisstein's World of Mathematics, Irregular Pair EXAMPLE 19 is the first weak irregular prime and divides A241601(11) = 50521, so a(1) = 11. CROSSREFS Cf. A035112, A250216, A000928, A120337, A128197. Sequence in context: A090920 A126330 A090506 * A208326 A097657 A041234 Adjacent sequences:  A250212 A250213 A250214 * A250216 A250217 A250218 KEYWORD nonn,more AUTHOR Eric Chen, Dec 26 2014 STATUS approved

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Last modified April 1 14:52 EDT 2020. Contains 333163 sequences. (Running on oeis4.)