A121644 -id:A121644 - cp's OEIS frontend

A120645 Numbers not in A121644.

7, 10, 11, 12, 15, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 35, 37, 38, 40, 42, 46, 47, 51, 54, 55, 56, 57, 58, 60, 62, 66, 70, 71, 74, 76, 78, 79, 80, 81, 83, 85, 90, 95, 97, 103, 105, 107, 109, 111, 112, 113, 114, 115, 118, 122, 126, 130, 132, 134, 138, 142, 144, 146

Offset: 1

Zak Seidov, Aug 15 2006

nonn

Complement of A121644.

Cf. A000027, A121644.

A084693 a(n) is smallest positive integer not already in the sequence such that every partial sum is squarefree.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 8, 9, 13, 7, 11, 10, 12, 14, 17, 15, 18, 19, 16, 20, 21, 22, 24, 25, 27, 26, 28, 23, 29, 30, 32, 33, 31, 34, 36, 38, 37, 35, 40, 41, 39, 42, 43, 45, 46, 44, 48, 49, 51, 50, 47, 52, 55, 53, 56, 57, 54, 58, 59, 60, 61, 63, 64, 65, 62, 66, 67, 68, 69, 70, 72, 73

Offset: 0

Amarnath Murthy, Jun 04 2003

nonn

Does every positive integer occur in the sequence?

The longest string of consecutive numbers is 6.

Michael De Vlieger, Table of n, a(n) for n = 0..1000

Cf. A121644 (strictly increasing version).

a = {1}; Do[k = 1; While[Nand[! MemberQ[a, k], SquareFreeQ[Sum[a[[i]], {i, n}] + k]], k++]; AppendTo[a, k], {n, 71}]; a (* Michael De Vlieger, Sep 03 2015 *)

More terms from David Wasserman, Dec 30 2004

cp's OEIS Frontend

A120645 Numbers not in A121644.

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A084693 a(n) is smallest positive integer not already in the sequence such that every partial sum is squarefree.

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