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 A168234 A138100(n) + A168142(n). 4
 3, 3, 13, 13, 13, 13, 13, 13, 13, 13, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 39, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 89, 171, 171, 171, 171, 171, 171, 171 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A138100 counts upwards in blocks of 2*k^2 numbers, restarting from 1,5,21,57,.. = A166464(k-1) = (2*k+1)*(2*k^2-4*k+3)/3, k>=1. A168142 counts downwards in blocks of 2*k^2 numbers, restarting from 2*k^2, k>=1. In consequence, the sequence here contains 2*k^2 copies of the number 1+2*k*(1+2*k^2)/3 = 1+A035597(k), k>=1, where the sequence A035597 is a bisection of A168380. LINKS Table of n, a(n) for n=1..67. CROSSREFS Cf. A134984, A138725, A168208. Sequence in context: A306529 A200921 A135949 * A141245 A147032 A146261 Adjacent sequences: A168231 A168232 A168233 * A168235 A168236 A168237 KEYWORD nonn,less AUTHOR Paul Curtz, Nov 21 2009 EXTENSIONS Edited by R. J. Mathar, Feb 15 2010 STATUS approved

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Last modified May 26 21:09 EDT 2024. Contains 372844 sequences. (Running on oeis4.)