A381228 Smallest k such that n appears in row k of the triangle in A381227, or -1 if n never appears in A381227.

1, 2, 3, 4, 4, 3, 10, 7, 7, 5, 5, 12, 12, 8, 8, 13, 13, 21, 36, 22, 22, 37, 14, 4, 9, 6, 6, 39, 39, 24, 24, 15, 15, 69, 41, 41, 25, 25, 42, 42, 72, 72, 10, 10, 43, 16, 16, 74, 128, 44, 44, 75, 130, 76, 76, 27, 27, 77, 77, 134, 134, 78, 46, 46, 17, 17, 79, 79, 28

Offset: 1

Author

N. J. A. Sloane, Feb 25 2025

Keywords

• nonn

Comments

Conjecture: Every positive integer appears in A381227.

Examples

			14 first appears in row 8 of A381227, so a(14) = 8.
		

Crossrefs

Cf. A139004, A381226, A381227, A381229.

Extensions

More terms from Jinyuan Wang, Feb 25 2025