A381223 Take the list (A381222) of successive values of the smallest number missing from A381019, and keep just the first of any run of successive equal terms.

2, 3, 4, 6, 10, 14, 18, 24, 26, 30, 34, 36, 42, 44, 45, 46, 50, 52, 54, 56, 58, 60, 66, 72, 76, 78, 84, 90, 96, 100, 102, 108, 110, 112, 114, 120, 122, 124, 126, 130, 136, 138, 144, 150, 156, 160, 162, 168, 170, 172, 174, 176, 180, 186, 188, 190, 192

Offset: 1

Author

N. J. A. Sloane, Feb 20 2025

Keywords

• nonn

Comments

All terms except 2 and 3 are composite numbers, although it is not obvious which composite numbers appear.

Examples

			A381222 begins 2, 3, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 10, 10, 10, ... and discarding terms which have already been seen we get 2, 3, 4, 6, 10, ...
		

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..128

Crossrefs

Cf. A381019, A381222.