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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

Table of n, a(n) for n=1..34.

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.)