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A242654 1 followed by the union of the terms > 2 in A002387 (or A004080) and A115515. 3
1, 3, 4, 10, 11, 30, 31, 82, 83, 226, 227, 615, 616, 1673, 1674, 4549, 4550, 12366, 12367, 33616, 33617, 91379, 91380, 248396, 248397, 675213, 675214, 1835420, 1835421, 4989190, 4989191, 13562026, 13562027, 36865411, 36865412, 100210580, 100210581, 272400599, 272400600, 740461600, 740461601, 2012783314 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Ray Chandler, May 29 2014, proposes this as the most likely continuation of A079353.

LINKS

Table of n, a(n) for n=1..42.

MATHEMATICA

b[n_] := Ceiling[k /. FindRoot[HarmonicNumber[k] == n, {k, Exp[n]}, WorkingPrecision -> 100]] - 1;

bb = Array[b, 22];

A242654 = Union[bb, bb + 1] // Rest (* Jean-Fran├žois Alcover, Apr 10 2019 *)

CROSSREFS

Cf. A002387, A004080, A115515, A079353.

Sequence in context: A091910 A131179 A079353 * A243681 A242881 A287448

Adjacent sequences:  A242651 A242652 A242653 * A242655 A242656 A242657

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 29 2014

STATUS

approved

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Last modified July 6 23:01 EDT 2020. Contains 335484 sequences. (Running on oeis4.)