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A101886 Smallest natural number sequence without any length 4 equidistant arithmetic subsequences. 7
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 (list; graph; refs; listen; history; text; internal format)
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: A121912 A189529 A120514 * A284509 A135674 A195121

Adjacent sequences:  A101883 A101884 A101885 * A101887 A101888 A101889

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified October 16 14:35 EDT 2018. Contains 316263 sequences. (Running on oeis4.)