

A077671


Triangular numbers whose digit permutations yield at least one further triangular number.


3



10, 105, 120, 153, 190, 210, 253, 300, 325, 351, 496, 630, 780, 820, 946, 1035, 1378, 1485, 1830, 1891, 2080, 2145, 2415, 2701, 2850, 3081, 3160, 3570, 3655, 3741, 3916, 4005, 4095, 4371, 4560, 4851, 4950, 5050, 5356, 5460, 5565, 5778, 6105, 6555, 7021
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OFFSET

0,1


LINKS

Table of n, a(n) for n=0..44.


EXAMPLE

153 and 190 are members yielding 351 and 091. But 66, 666 are not members.


MATHEMATICA

trl=Rest[FoldList[Plus, 0, Range[2000]]]; okQ[n_] := Module[{p=Complement[FromDigits/@Permutations[IntegerDigits[n]], {n}]}, Length[Intersection[p, trl]]>0]; Select[Take[trl, 100], okQ]


CROSSREFS

Cf. A069674, A095869, A095870.
Sequence in context: A163309 A163165 A110957 * A117832 A117833 A210136
Adjacent sequences: A077668 A077669 A077670 * A077672 A077673 A077674


KEYWORD

nonn,base


AUTHOR

Amarnath Murthy, Nov 16 2002


EXTENSIONS

More terms from Harvey P. Dale, Nov 22 2002
Extended by Ray Chandler, Jun 29 2004


STATUS

approved



