

A224421


The indices of tetrahedral numbers that are also triangular.


0




OFFSET

0,3


LINKS

Table of n, a(n) for n=0..5.
E. T. Avanesov, Solution of a problem on figurate numbers (in Russian), Acta Arith. 12 1966/1967 pages 409420.


EXAMPLE

The eighth tetrahedral number is 120, which is also a triangular number. Hence, 8 belongs to the sequence.


PROG

(PARI) for(n=0, 34, if(ispolygonal(n*(n+1)*(n+2)/6, 3), print1(n", "))) \\ Charles R Greathouse IV, Apr 07 2013


CROSSREFS

Cf. A027568, A102349.
Sequence in context: A195676 A027299 A321067 * A143785 A182735 A135565
Adjacent sequences: A224418 A224419 A224420 * A224422 A224423 A224424


KEYWORD

nonn,full,fini


AUTHOR

Tanya Khovanova, Apr 06 2013


STATUS

approved



