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A264988 The left edge of A263267. 4
0, 1, 3, 5, 7, 13, 17, 19, 23, 27, 29, 31, 35, 37, 41, 43, 51, 53, 57, 59, 61, 65, 67, 71, 73, 77, 79, 143, 149, 151, 155, 157, 161, 163, 173, 177, 179, 181, 185, 191, 193, 199, 203, 209, 211, 215, 219, 223, 231, 233, 237, 239, 241, 249, 251, 263, 267, 269, 271, 277, 285, 291, 293, 299, 303, 315, 317, 321, 327, 333, 335, 337, 341, 347, 349, 357, 359, 369, 517, 531, 535, 523, 527 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The first point where the sequence is nonmonotonic is the dip from a(80) = 535 to a(81) = 523.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..10001

FORMULA

a(0) = 0; for n >= 1, a(n) = A263267(A263260(n-1)).

Other identities. For all n >= 0:

A155043(a(n)) = n.

a(A262508(n)) = A262509(n) = A263269(A262508(n)). [In case A262508 and A262509 are infinite sequences.]

PROG

(Scheme)

(define (A264988 n) (if (zero? n) n (A263267 (A263260 (- n 1)))))

CROSSREFS

Cf. A263260, A262508, A262509.

The left edge of irregular table A263267.

Cf. A263269 (the other edge).

Differs from A261089 for the first time at n=69, where a(69) = 333, while A261089(69) = 331.

Sequence in context: A247458 A008996 A261089 * A031163 A106119 A152820

Adjacent sequences:  A264985 A264986 A264987 * A264989 A264990 A264991

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 29 2015

STATUS

approved

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Last modified February 17 16:26 EST 2018. Contains 299296 sequences. (Running on oeis4.)