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A078998
Choose a(n) so that a(1)+a(2)+...+a(n) = concatenation of n first natural numbers.
+0
1
1, 11, 111, 1111, 11111, 111111, 1111111, 11111111, 111111111, 12222222121, 1222222212101, 122222221210101, 12222222121010101, 1222222212101010101, 122222221210101010101, 12222222121010101010101
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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