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A070152 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. 2
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; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..45.

R. Hoshino, Astonishing Pairs of Numbers, Crux Mathematicorum 27(1), 2001, p. 39-44.

EXAMPLE

We have 1+...+5 = 15; 2+...+7 = 27; 4+...+29 = 429; 13+...+53 = 1353; 18+...+63 = 1863; etc.

CROSSREFS

Cf. A070153, A071297.

Sequence in context: A033628 A077319 A018701 * A176126 A240096 A018761

Adjacent sequences:  A070149 A070150 A070151 * A070153 A070154 A070155

KEYWORD

nonn,base

AUTHOR

Lekraj Beedassy, May 06 2002

EXTENSIONS

More terms from David W. Wilson, Jun 04 2002

STATUS

approved

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Last modified June 25 20:26 EDT 2017. Contains 288730 sequences.