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A026411 Position of the second n in A026409. 0
4, 6, 10, 12, 15, 19, 23, 25, 30, 36, 43, 45, 51, 54, 66, 67, 77, 87, 90, 99, 100, 124, 125, 135, 139, 145, 158, 178, 180, 196, 197, 201, 225, 241, 252, 256, 258, 283, 302, 303, 321, 327, 350, 383, 390, 405, 407, 426, 447, 459, 477, 520, 523, 542, 568, 569, 586, 611, 614, 615 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..61.

CROSSREFS

Sequence in context: A036438 A066190 A058012 * A020189 A166986 A318487

Adjacent sequences:  A026408 A026409 A026410 * A026412 A026413 A026414

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Sep 26 2019

STATUS

approved

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Last modified August 7 15:30 EDT 2020. Contains 336276 sequences. (Running on oeis4.)