A071297 Number of n-digit terms of A070153.

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

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

Table of n, a(n) for n=1..54.

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: A360896 A375888 A084432 * A356875 A114393 A241256

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