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A202342 Numbers occurring exactly twice in Hofstadter H-sequence A005374. 5
1, 4, 5, 7, 10, 13, 14, 17, 18, 20, 23, 24, 26, 29, 32, 33, 35, 38, 41, 42, 45, 46, 48, 51, 54, 55, 58, 59, 61, 64, 65, 67, 70, 73, 74, 77, 78, 80, 83, 84, 86, 89, 92, 93, 95, 98, 101, 102, 105, 106, 108, 111, 112, 114, 117, 120, 121, 123, 126, 129, 130, 133 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A202340(a(n)) = 2.

LINKS

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

Eric Weisstein's World of Mathematics, Hofstadter H-Sequence.

Wikipedia, Hofstadter sequence

Index entries for Hofstadter-type sequences

PROG

(Haskell)

import Data.List (elemIndices)

a202342 n = a202342_list !! (n-1)

a202342_list = elemIndices 2 a202340_list

CROSSREFS

Cf. A005374, A202340, A202341 (complement).

Sequence in context: A269861 A187479 A013947 * A234141 A093517 A248858

Adjacent sequences:  A202339 A202340 A202341 * A202343 A202344 A202345

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 17 2011

STATUS

approved

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Last modified January 27 17:58 EST 2020. Contains 331296 sequences. (Running on oeis4.)