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A350301
Irregular triangle read by rows: The n-th row lists the smaller number in each "n-th power friendship", that is, numbers k such that digsum(digsum(k^n)^n) = k and digsum(k^n) > k.
2
13, 19, 18, 23, 31, 38, 44, 46, 56, 64, 35, 109, 52, 112, 118, 127, 97, 108, 144, 88, 144, 139, 152, 153, 154, 173, 178, 189, 172, 199, 203, 187, 234, 127, 188, 148, 238, 115, 229, 238, 239, 245, 234, 244, 245, 283, 252, 283, 161, 271, 288, 163, 259, 295, 316
OFFSET
2,1
EXAMPLE
Triangle begins:
13;
19;
18;
23, 31;
;
38, 44, 46, 56;
64;
35;
;
;
109;
52, 112, 118, 127;
97, 108;
144;
88, 144;
...
CROSSREFS
KEYWORD
nonn,base,tabf
AUTHOR
Daniel Carter, Dec 23 2021
STATUS
approved