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 A071297 Number of n-digit terms of A070153. 2
 2, 5, 4, 10, 8, 56, 8, 39, 10, 38, 9, 208, 15, 37, 95, 143, 7, 502, 2, 319, 184, 235, 2, 1631, 68, 142, 58, 614, 71, 14216, 14, 5286, 81, 149, 251, 4018, 12, 17, 79, 5162, 21, 43065, 34, 3858, 932, 140, 6, 12852, 27, 2457, 360, 1121, 37, 10014 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Pairs (r,s) = (A070152(k), A070153(k)) are such that sum(j=r to s, j) equals the concatenation of r and s. LINKS R. Hoshino, Astonishing Pairs of Numbers, Crux Mathematicorum 27(1), 2001, p. 39-44. EXAMPLE a(3) = 4 since 119, 403, 533, 623 are the only three-digit terms of A070153. CROSSREFS Cf. A070152, A070153. Sequence in context: A120119 A048678 A084432 * A114393 A180338 A100710 Adjacent sequences:  A071294 A071295 A071296 * A071298 A071299 A071300 KEYWORD nonn,base AUTHOR Lekraj Beedassy, Jun 11 2002 EXTENSIONS Edited and corrected by Klaus Brockhaus, Jun 06 2003 a(6), a(7) and a(8) from Klaus Brockhaus, Jun 20 2003 a(6) corrected and terms a(9) onward added by Max Alekseyev, Feb 13 2012 STATUS approved

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