A327782 Numbers n that cannot be written as a sum of two or more distinct parts with the largest part dividing n.

1, 2, 3, 4, 5, 7, 9, 11, 13, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 97, 101, 103, 107, 109, 113, 121, 127, 131, 137, 139, 143, 149, 151, 157, 163, 167, 169, 173, 179, 181, 187, 191, 193, 197, 199, 209, 211, 221

Offset

1,2

Comments

After initial terms, first differs from A308168 in having 209.

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Francisco Javier de Vega, Some Variants of Integer Multiplication, Axioms (2023) Vol. 12, 905. See p. 8.

Mathematica

Select[Range[100], #==1||#-Divisors[#][[-2]]>Total[Range[Divisors[#][[-2]]-1]]&]

Crossrefs

Cf. A000009, A018818, A032742, A033630, A102627, A326836, A326837, A326841, A326850, A326851, A327783.

Sequence in context: A343983 A074583 A001092 * A000430 A166684 A067126

Adjacent sequences: A327779 A327780 A327781 * A327783 A327784 A327785

Keyword

nonn

Author

Gus Wiseman, Sep 25 2019

Status

approved