|
|
A214419
|
|
Numbers not representable as the sum of three 10-gonal numbers.
|
|
2
|
|
|
4, 5, 6, 7, 8, 9, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 31, 32, 33, 34, 35, 36, 39, 40, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 56, 57, 58, 59, 60, 61, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 82, 83, 84, 88, 90, 91, 92, 93, 94, 97, 98
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
It is conjectured that 7687 positive numbers are not the sum of three 10-gonal numbers.
|
|
REFERENCES
|
R. K. Guy, Unsolved Problems in Number Theory, D3.
|
|
LINKS
|
|
|
MATHEMATICA
|
nn = 750; dec = Table[n*(4*n-3), {n, 0, nn}]; t = Table[0, {dec[[-1]]}]; Do[n = dec[[i]] + dec[[j]] + dec[[k]]; If[n <= dec[[-1]], t[[n]] = 1], {i, nn}, {j, i, nn}, {k, j, nn}]; Flatten[Position[t, 0]]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,fini
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|