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Search: id:A071297
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OFFSET
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1,1
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COMMENT
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Pairs (r,s) = (A070152(k), A070153(k)) are such that sum(j=r to s, j) equals the concatenation of r and s.
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REFERENCES
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R. Hoshino, "Astonishing Pairs of Numbers", Crux Mathematicorum, vol. 27, no. 1 Feb. 2001, p. 42.
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LINKS
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Canadian Mathematical Society, Crux Mathematicorum, Feb. 2001 issue
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EXAMPLE
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a(3) = 4 since 119, 403, 533, 623 are the only three-digit terms of A070153.
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CROSSREFS
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Cf. A070152, A070153.
Sequence in context: A120119 A048678 A084432 this_sequence A114393 A100710 A069913
Adjacent sequences: A071294 A071295 A071296 this_sequence A071298 A071299 A071300
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KEYWORD
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more,nonn,base
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Jun 11 2002
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EXTENSIONS
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Edited and corrected by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jun 06 2003
a(6), a(7) and a(8) from Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jun 20 2003
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