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A263838 Reversal numbers: union of A257719 and A257720. 3
12, 18, 20, 25, 34, 36, 40, 44, 48, 56, 70, 72, 74, 80, 81, 88, 100, 104, 106, 108, 112, 121, 124, 134, 144, 156, 160, 162, 184, 192, 194, 196, 200, 202, 208, 218, 220, 228, 260, 268, 272, 274, 284, 288, 289, 300, 304, 314, 320, 324, 336, 346, 350, 352, 361, 368, 372, 386, 392, 394, 400, 416, 432, 441 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

P. Pollack, C. Pomerance, Some problems of Erdős on the sum-of-divisors function, For Richard Guy on his 99th birthday: May his sequence be unbounded, 2015, to appear.

PROG

(Haskell)

import Data.List.Ordered (union)

a263838 n = a263838_list !! (n-1)

a263838_list = union a257719_list a257720_list

-- Reinhard Zumkeller, Oct 31 2015

CROSSREFS

Cf. A257719, A257720.

Sequence in context: A215012 A181595 A263189 * A217856 A253388 A030515

Adjacent sequences:  A263835 A263836 A263837 * A263839 A263840 A263841

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 30 2015

STATUS

approved

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Last modified March 24 06:56 EDT 2019. Contains 321444 sequences. (Running on oeis4.)