A264988 The left edge of A263267.

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

Offset: 0

Author

Antti Karttunen, Nov 29 2015

Keywords

• nonn

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

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.

Programs

Scheme

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

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.]