A338451 a(n) is the least positive number that does not appear among the first n terms of A338338.

2, 3, 3, 3, 5, 5, 7, 7, 7, 7, 11, 11, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 17, 17, 17, 17, 17, 19, 19, 19, 19, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 29

Offset: 1

Author

Rémy Sigrist, Oct 28 2020

Keywords

• nonn

Comments

Conjecture: this sequence is unbounded (and A338338 is a permutation of the positive numbers).

Examples

			For n = 3:
- A338338(1) = 1,
- A338338(2) = 2,
- A338338(3) = 4,
- the number 3 is the least missing number,
- so a(3) = 3.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, C program for A338451

Crossrefs

Cf. A280740, A338338.

Programs

C

/* See Links section. */