

A104396


Sums of 6 distinct positive pentatope numbers (A000332).


4



252, 336, 392, 427, 447, 456, 457, 461, 512, 547, 567, 577, 581, 596, 621, 631, 651, 661, 665, 677, 687, 707, 712, 717, 721, 732, 742, 746, 752, 756, 761, 772, 776, 786, 796, 816, 826, 830, 841, 852, 872, 881, 882, 886, 897, 907, 916, 917, 921, 932
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OFFSET

1,1


COMMENTS

Pentatope number Ptop(n) = binomial(n+3,4) = n*(n+1)*(n+2)*(n+3)/24.
Hyun Kwang Kim asserts that every positive integer can be represented as the sum of no more than 8 pentatope numbers; but in this sequence we are only concerned with sums of nonzero distinct pentatope numbers.


REFERENCES

Conway, J. H. and Guy, R. K. The Book of Numbers. New York: SpringerVerlag, pp. 5557, 1996.


LINKS

Table of n, a(n) for n=1..50.
Hyun Kwang Kim, On Regular Polytope Numbers, Proc. Amer. Math. Soc., 131 (2003), 6575.
J. V. Post, Table of Polytope Numbers, Sorted, Through 1,000,000.
Eric Weisstein's World of Mathematics, Pentatope Number.


FORMULA

a(n) = Ptop(f) + Ptop(g) + Ptop(h) + Ptop(i) + Ptop(j) + Ptop(k) for some positive f=/=g=/=h=/=i=/=j=/=k and Ptop(n) = binomial(n+3,4).


CROSSREFS

Cf. A000332, A100009, A102857, A104392, A104393, A104394, A104395.
Sequence in context: A330616 A046331 A066695 * A207373 A072443 A129623
Adjacent sequences: A104393 A104394 A104395 * A104397 A104398 A104399


KEYWORD

easy,nonn


AUTHOR

Jonathan Vos Post, Mar 05 2005


EXTENSIONS

Extended by Ray Chandler, Mar 05 2005


STATUS

approved



