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A158859
a(n) is formed by 2n+1 concatenations of the digit 2r+1 where n=r (mod 5).
1
1, 333, 55555, 7777777, 999999999, 11111111111, 3333333333333, 555555555555555, 77777777777777777, 9999999999999999999, 111111111111111111111, 33333333333333333333333
OFFSET
0,2
COMMENTS
One 1, three 3's, five 5's, seven 7's, nine 9's, eleven 1's, thirteen 3's,
CROSSREFS
Cf. A158849.
Sequence in context: A233030 A250835 A221827 * A367978 A182098 A331411
KEYWORD
nonn,base
AUTHOR
Paul Curtz, Mar 28 2009
EXTENSIONS
Definition modified by R. J. Mathar, Apr 06 2009
STATUS
approved