

A215689


Smallest prime whose decimal expansion consists of the concatenation of a 1digit square, a 2digit square, a 3digit square, ..., and an ndigit square, or 0 if there is no such prime.


1



0, 149, 125441, 1161002209, 116100102414161, 116100102410000106929, 1161001024100001004891442401, 116100102410000100489100000010169721, 116100102410000100489100000010004569100460529, 1161001024100001004891000000100045691000000001009269361
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..10.


EXAMPLE

a(2) = 149, which is a prime, and the concatenation of 1 = 1^2 with 49 = 7^2.
a(3) = 125441, which is a prime, and the 1 = 1^2 with 25 = 5^2 with 441 = 21^2.


CROSSREFS

Cf. A000040, A000290, A215641, A215647.
Sequence in context: A188566 A188753 A188873 * A104262 A048706 A054729
Adjacent sequences: A215686 A215687 A215688 * A215690 A215691 A215692


KEYWORD

nonn,base


AUTHOR

Jonathan Vos Post, Aug 20 2012


EXTENSIONS

More terms from Alois P. Heinz, Aug 21 2012


STATUS

approved



