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A037260 a()=A037260 and its first [ A037261 ], 2nd [ A037262 ] and 3rd [ A037263 ] differences together include every number at most once and are monotonic and minimal. 5
1, 3, 9, 26, 62, 127, 233, 393, 621, 932, 1342, 1869, 2533, 3355, 4357, 5562, 6994, 8678, 10641, 12911, 15518, 18493, 21868, 25676, 29951, 34728, 40044, 45937, 52446, 59611, 67474, 76078, 85467, 95686, 106781, 118799, 131788, 145797 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

5 is the only number less than 100 not used in any of the 4 sequences - Larry Reeves (larryr(AT)acm.org), Sep 25 2000

LINKS

Table of n, a(n) for n=0..37.

EXAMPLE

After 1 3 9 26 62

------ 2 6 17 36

------- 4 11 19

-------- 7 8

the next free number is 10 which we CAN add to 4th row.

CROSSREFS

A037260-A037263 are 4-rowed analog of A037257-A037259. See A005228, A030124 for 2-rowed version.

Sequence in context: A119825 A235538 A218916 * A035313 A055293 A034531

Adjacent sequences:  A037257 A037258 A037259 * A037261 A037262 A037263

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Sep 25 2000

STATUS

approved

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Last modified December 8 20:11 EST 2021. Contains 349596 sequences. (Running on oeis4.)