A374797 Distinct value of A003990 (LCM table read by antidiagonals) in order of appearance.

1, 2, 3, 4, 6, 5, 10, 12, 7, 15, 8, 14, 20, 9, 21, 18, 24, 28, 30, 11, 35, 22, 36, 40, 42, 13, 33, 45, 26, 44, 56, 39, 55, 63, 16, 52, 60, 66, 70, 72, 17, 65, 77, 34, 48, 78, 84, 88, 90, 19, 51, 91, 99, 38, 68, 80, 104, 110, 57, 85, 105, 117, 76, 102, 112, 120

Offset: 1

Author

Rémy Sigrist, Jul 20 2024

Keywords

• nonn
• look

Comments

This sequence is a permutation of the positive integers with inverse A374798 and similar to A257471.

Examples

			The first terms of A003990 are: 1, 2, 2, 3, 2, 3, 4, 6, 6, 4, 5, 4, 3, 4, 5, 6, 10. Removing duplicates yields 1, 2, 3, 4, 6, 5, 10.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, PARI program
• Index entries for sequences that are permutations of the natural numbers

Crossrefs

Cf. A003990, A257471 (analog for multiplication table), A374798 (inverse).

Programs

PARI

\\ See Links section.