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A337947
Numbers that do not appear in the addition or multiplication table of A337946.
5
5, 11, 16, 17, 18, 20, 26, 27, 28, 32, 35, 38, 39, 40, 41, 43, 45, 46, 51, 53, 55, 56, 57, 58, 63, 65, 67, 70, 71, 72, 74, 75, 76, 78, 79, 80, 81, 82, 87, 89, 93, 95, 96, 98, 99, 100, 101, 102, 103, 104, 105, 106, 109, 110, 111, 112, 117, 118, 119, 121, 123
OFFSET
1,1
EXAMPLE
The addition table of A337946(k) for k=1..5:
+ | 1 3 7 12 22
---+-------------
1 | 2 4 8 13 23
3 | 6 10 15 25
7 | 14 19 29
12 | 24 34
22 | 44
The multiplication table of A337946(k) for k=1..5:
* | 1 3 7 12 22
---+---------------
1 | 1 3 7 12 22
3 | 9 21 36 66
7 | 49 84 154
12 | 144 264
22 | 484
Neither of these two tables contain 5, 11, 16, 17, 18, or 20. Since each row is strictly increasing, the rest of the two (infinite) tables do not contain these values either.
CROSSREFS
KEYWORD
nonn
AUTHOR
Peter Kagey, Oct 02 2020
STATUS
approved