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A073158 a() = 1,2,4,7,... [ A073158 ], adjacent sums = 3,6,11... [ A073159 ] and 2nd adjacent sums = 9,17,... [ A073160 ] are disjoint but not monotonic; adjoin next free number to A073158 to construct three sequences that together include all positive integers. 3
1, 2, 4, 7, 5, 8, 10, 14, 15, 19, 16, 20, 21, 22, 26, 28, 27, 30, 32, 33, 37, 38, 40, 39, 44, 45, 47, 46, 49, 50, 51, 52, 56, 58, 60, 61, 59, 64, 66, 68, 72, 67, 74, 73 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n)/n is asymptotic to 7n/4.

LINKS

Table of n, a(n) for n=1..44.

FORMULA

A073158:_1, 2, 4, 7, 5, 8, 10, 14, 15, 19, 16, 20, 21, 22, 26, 28, 27, ... A073159:__3, 6, 11, 12, 13, 18, 24, 29, 34, 35, 36, 41, 43, 48, 54, 55, ... A073160:___9, 17, 23, 25, 31, 42, 53, 63, 69, 71, 77, 84, 91, 102, 109, ...

CROSSREFS

Cf. A037257, A035311, A073159, A073160.

Sequence in context: A021408 A011178 A136790 * A035311 A182310 A244591

Adjacent sequences:  A073155 A073156 A073157 * A073159 A073160 A073161

KEYWORD

easy,nonn

AUTHOR

Paul D. Hanna, Jul 29 2002

STATUS

approved

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Last modified December 3 05:29 EST 2020. Contains 338899 sequences. (Running on oeis4.)