A136603 Positive numbers having a unique representation by inserting minus and plus-signs in 123456789.

176, 191, 194, 196, 209, 213, 215, 217, 223, 237, 253, 259, 263, 272, 274, 275, 289, 290, 292, 293, 295, 305, 307, 308, 353, 361, 367, 379, 380, 381, 382, 386, 392, 399, 401, 405, 415, 416, 418, 419, 427, 443, 461, 463, 467, 475, 477, 479, 481, 490, 491

Offset

1,1

Comments

A066957(a(n)) = 1; subsequence of A136601;

the sequence is finite with 869 terms.

Links

R. Zumkeller, Table of n, a(n) for n = 1..869 (full sequence)

Example

a(1) = 176 = 1 - 2 + 34 + 56 + 78 + 9;
a(2) = 191 = 123 + 4 + 56 + 7 - 8 + 9;
a(3) = 194 = 1 - 2 + 34 + 5 + 67 + 89;
a(4) = 196 = -1 + 2 + 34 + 5 + 67 + 89;
a(5) = 209 = 1 + 234 + 56 + 7 - 89;
a(6) = 213 = 123 + 4 + 5 - 6 + 78 + 9;
a(7) = 215 = 123 + 4 - 5 + 6 + 78 + 9;
a(8) = 217 = 123 - 4 + 5 + 6 + 78 + 9;
a(9) = 223 = -1 + 23 + 45 + 67 + 89;
a(10) = 237 = -123 + 456 - 7 - 89;
a(11) = 253 = -1 + 2 + 345 - 6 - 78 - 9;
a(12) = 259 = -1 + 234 - 56 - 7 + 89;
a(869) = 123456789 = A136602(1715).

Crossrefs

Sequence in context: A344280 A266058 A261678 * A114824 A370251 A305062

Adjacent sequences: A136600 A136601 A136602 * A136604 A136605 A136606

Keyword

nonn,fini,full,base

Author

Reinhard Zumkeller, Jan 12 2008

Status

approved