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A139419 a(n) = first term of the n-th run of consecutive numbers in A136120. 4
1, 3, 9, 15, 22, 36, 48, 69, 87, 116, 141, 167, 194, 222, 269, 308, 368, 419, 471, 524, 578, 633, 719, 791, 896, 986, 1077, 1169, 1262, 1356, 1451, 1591, 1710, 1876, 2020, 2213, 2383, 2604, 2801, 3051, 3276, 3502, 3729, 3957, 4186, 4416, 4647, 4879, 5112 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Klaus Brockhaus, Table of n, a(n) for n=1..396

EXAMPLE

A136120 starts 1, 3, 4, 5, 9, 10, 15, ..., so a(1) = 1, a(2) = 3, a(3) = 9.

MATHEMATICA

f[seq_] := Module[{s = seq, n1, n2}, n++; n1 = s[[n]] + n; If[n1 <= len, n2 = Min[n - 1 + 2*s[[n]], len]; len -= n2 - n1 + 1; Drop[s, {n1, n2}], s]]; n = 0; len = 5200; First /@Split[FixedPoint[f, Range[len]], #2 - #1 == 1 &] (* Jayanta Basu, Jun 15 2013 - using the Mma program in A136120 *)

CROSSREFS

Cf. A136120, A139418, A139420.

Sequence in context: A174786 A216974 A246298 * A323031 A058972 A026222

Adjacent sequences:  A139416 A139417 A139418 * A139420 A139421 A139422

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Apr 22 2008

STATUS

approved

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Last modified May 7 19:23 EDT 2021. Contains 343652 sequences. (Running on oeis4.)