

A071261


Smallest k such that p(k)c(k) is an ndigit number where p(k) is the kth prime and c(k) is the kth composite number.


0



1, 10, 37, 206, 1401, 10626, 85316, 712597, 6117420, 53593619, 476889480, 4295913223, 39084524707, 358521889961, 3311439169717, 30765562102926, 287282165065268, 2694418859703791, 25368958219747617
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..19.


CROSSREFS

Cf. A038529.
Sequence in context: A110528 A208674 A137280 * A129426 A215881 A279543
Adjacent sequences: A071258 A071259 A071260 * A071262 A071263 A071264


KEYWORD

hard,more,nonn,base


AUTHOR

Amarnath Murthy, May 30 2002


EXTENSIONS

Corrected and extended by Gabriel Cunningham (gcasey(AT)mit.edu), Apr 08 2003
More terms from Sean A. Irvine, Nov 30 2009
a(12)a(15) from Donovan Johnson, Dec 30 2010
a(16)a(19) from Chai Wah Wu, Apr 17 2018


STATUS

approved



