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A070153 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 b of each pair. 2
5, 7, 29, 53, 63, 88, 91, 119, 403, 533, 623, 2148, 2353, 2813, 3835, 5333, 6076, 6223, 7889, 8728, 9163, 25039, 26603, 51513, 53333, 55168, 62223, 85338, 93633, 103463, 119063, 134938, 159518, 175238, 185979, 213073, 219413, 235313, 242818, 264888 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..40.

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. A070152, A071297.

Sequence in context: A104683 A153121 A280926 * A171619 A153411 A081630

Adjacent sequences:  A070150 A070151 A070152 * A070154 A070155 A070156

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.