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A070153
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Take pairs (x,y) with Sum_{j = x..y} j = concatenation of x and y. Sort pairs on y then x. This sequence gives y of each pair.
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6
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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
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OFFSET
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1,1
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COMMENTS
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Some subsequences, from Diophante and Crux Mathematicorum:
{(8*10^m-5)/15, m >= 1} = 5, 53, 533, 5333, ... (A350995).
{7*(4*10^m+5)/45, m >= 1} = 7, 63, 623, 6223, ...
{13*(224*100^m-125)/12375, m >= 2} = 2353, 235313, 23531313, ... (End)
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LINKS
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EXAMPLE
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1+...+5 = 15; 2+...+7 = 27; 4+...+29 = 429; 13+...+53 = 1353; 18+...+63 = 1863.
133+...+533 = 133533.
178+...+623 = 178623.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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