

A213189


Triangular numbers which are leg of a Pythagorean triple with hypotenuse in A213188.


1



6, 36, 91, 120, 210, 253, 300, 378, 528, 630, 1176, 2016, 2346, 3003, 3240, 3828, 4560, 4656, 4950, 5460, 6105, 6903, 7140, 7260, 8778, 10296, 11628, 13530, 14028, 14196, 15400, 17766, 19110, 23220, 23436, 24310, 25200, 26796, 32640, 34980, 41616, 43365, 44253, 52326, 55278
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..45.


EXAMPLE

Triangular 91 and triangular 325 form a Pythagorean triple {325, 91, 312}.


PROG

(PARI) {for(i=1, 10^3, k=i+1; v=1; a=i*(i+1)/2; while(k<i*i&&v, b=k*(k+1)/2; if(issquare(b*ba*a), v=0; print1(a, ", ")); k+=1))}


CROSSREFS

Cf. A213188.
Sequence in context: A207026 A207171 A207454 * A080857 A108158 A207559
Adjacent sequences: A213186 A213187 A213188 * A213190 A213191 A213192


KEYWORD

nonn


AUTHOR

Antonio Roldán, Feb 28 2013


STATUS

approved



