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A213724 Largest natural number x such that x = n + A000120(x), or zero if no such number exists. 16
1, 3, 0, 5, 7, 0, 0, 9, 11, 0, 13, 15, 0, 0, 0, 17, 19, 0, 21, 23, 0, 0, 25, 27, 0, 29, 31, 0, 0, 0, 0, 33, 35, 0, 37, 39, 0, 0, 41, 43, 0, 45, 47, 0, 0, 0, 49, 51, 0, 53, 55, 0, 0, 57, 59, 0, 61, 63, 0, 0, 0, 0, 0, 65, 67, 0, 69, 71, 0, 0, 73, 75, 0, 77, 79, 0, 0, 0, 81, 83, 0, 85, 87, 0, 0, 89, 91 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(0)=1; and for n>=1, a(n)=0 if A079559(n)=0 (i.e., if A213723(n)=0); otherwise A213723(n)+1.
PROG
(Scheme): (define (A213724 n) (if (zero? n) 1 (let ((v (A213723 n))) (if (zero? v) v (+ 1 v)))))
(Haskell)
a213724 0 = 1
a213724 n = a213723 n + signum (a213723 n)
-- Reinhard Zumkeller, May 01 2015
CROSSREFS
One more than A213723 at its nonzero points. a(A005187(n)) = A005408(n). Used for computing A213725-A213727.
Cf. A179016. - M. F. Hasler, Nov 01 2012
Sequence in context: A308123 A308089 A249859 * A350082 A362241 A019915
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 01 2012
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)