A101886 Smallest natural number sequence without any length 4 equidistant arithmetic subsequences.

1, 2, 3, 5, 6, 7, 9, 10, 11, 14, 15, 16, 18, 19, 20, 22, 24, 27, 28, 29, 31, 32, 35, 36, 37, 39, 41, 42, 43, 47, 48, 50, 51, 53, 55, 58, 60, 61, 63, 65, 66, 68, 70, 71, 72, 77, 78, 80, 82, 85, 86, 87, 89, 90, 91, 94, 95, 96, 98, 99, 100, 102, 103, 104, 107, 109, 110, 111, 114

Offset

1,2

Links

Table of n, a(n) for n=1..69.

Example

4 is out because of 1,2,3,4. 13 is out because of 1,5,9,13.

Crossrefs

Cf. A101887, A101884, A101888.

A selection of sequences related to "no three-term arithmetic progression": A003002, A003003, A003278, A004793, A005047, A005487, A033157, A065825, A092482, A093678, A093679, A093680, A093681, A093682, A094870, A101884, A101886, A101888, A140577, A185256, A208746, A229037.

Sequence in context: A328393 A189529 A120514 * A284509 A135674 A371188

Adjacent sequences: A101883 A101884 A101885 * A101887 A101888 A101889

Keyword

nonn

Author

Douglas Stones (dssto1(AT)student.monash.edu.au), Dec 20 2004

Status

approved