A037021 Greedy sequence such that no term is the average of four others.

0, 1, 2, 3, 5, 7, 13, 26, 27, 28, 29, 31, 122, 123, 124, 125, 127, 129, 135, 148, 149, 150, 151, 153, 610, 611, 612, 613, 615, 617, 623, 636, 637, 638, 639, 641, 732, 733, 734, 735, 737, 739, 745, 758, 759, 760, 761, 763, 3050, 3051

Offset

1,3

References

Related to R. K. Guy, Unsolved Problems in Number Theory, Section C16.

Links

Table of n, a(n) for n=1..50.

D. Tseng, Generalized nonaveraging integer sequences, Integers 12 (2012), no. 2, 275-300.

Formula

Terms are integers of the form 122A+R, where A has 0's and 1's in its base 5 expansion, and R is in the set {0, 1, 2, 3, 5, 7, 13, 26, 27, 28, 29, 31}. - Dennis Tseng, Jul 19 2013

Crossrefs

Sequence in context: A227627 A335116 A135372 * A359505 A114741 A096177

Adjacent sequences: A037018 A037019 A037020 * A037022 A037023 A037024

Keyword

nonn

Author

John W. Layman

Status

approved