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A070152
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Take pairs (a,b) with Sum(j = a to b; j) = concatenation of a and b. Sort pairs on b then a. This sequence gives a of each pair.
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2
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1, 2, 4, 13, 18, 33, 35, 7, 78, 133, 178, 228, 273, 388, 710, 1333, 1701, 1778, 2737, 3273, 3563, 3087, 3478, 12488, 13333, 14208, 17778, 31463, 36993, 5338, 7063, 9063, 12643, 15238, 17147, 22448, 23788, 27313, 29058, 34488, 36763, 38788, 43273, 50813, 53578
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| R. Hoshino, Astonishing Pairs of Numbers, Crux Mathematicorum 27(1), 2001, p. 39-44.
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EXAMPLE
| We have 1+...+5=15;2+...+7=27;4+...+29=429;13+...+53=1353;18+...+63=1863, etc.
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CROSSREFS
| Cf. A070153, A071297
Sequence in context: A033628 A077319 A018701 * A176126 A018761 A179114
Adjacent sequences: A070149 A070150 A070151 * A070153 A070154 A070155
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KEYWORD
| nonn,base,changed
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), May 06 2002
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EXTENSIONS
| More terms from David W. Wilson, Jun 04, 2002
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