



0, 7, 84, 855, 7986, 64455, 287568, 5666105, 276309378, 8888888889, 274200559500, 8804989337145, 301763995481142, 11100895714446905, 437782779269748264, 18445632962598440505, 827229150775225653066
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OFFSET

1,2


COMMENTS

20^2011111111111111111111=104857588888888888888888889 is the only known prime term of this sequence. Next such prime has more than 40000 digits (n>10000)!


LINKS

Robert Israel, Table of n, a(n) for n = 1..386


FORMULA

a(n) = n^n  (10^n1)/9.  Robert Israel, Oct 23 2016


EXAMPLE

a(2) = 2^211 = 7, a(8) = 8^811111111 = 5666105.


MAPLE

seq(n^n  (10^n1)/9. n=1..20); # Robert Israel, Oct 23 2016


MATHEMATICA

Table[n^n  (10^n  1)/9, {n, 17}]


CROSSREFS

Cf. A000312, A002275, A177010.
Sequence in context: A027819 A269895 A272496 * A099674 A067413 A166178
Adjacent sequences: A177006 A177007 A177008 * A177010 A177011 A177012


KEYWORD

easy,sign,base


AUTHOR

Ali Heydarian (mymontain(AT)yahoo.com), May 13 2010


STATUS

approved



