A344377 Numbers that are both 11-gonal numbers (A051682) and 11-gonal pyramidal numbers (A007586).

0, 1, 23725, 1519937678700, 7248070597636

Offset

1,3

Comments

Intersection of A051682 and A007586.

Links

Table of n, a(n) for n=1..5.

Numberphile, Cannon Ball Numbers.

Prog

(PARI) for(k=0, 1e5, if(ispolygonal(m=k*(k+1)*(3*k-2)/2, 11), print1(m", ")))

Crossrefs

Cf. A007586, A027568, A051682, A344280, A344376.

Sequence in context: A223342 A179918 A168169 * A031649 A011254 A226002

Adjacent sequences: A344374 A344375 A344376 * A344378 A344379 A344380

Keyword

nonn,more

Author

Seiichi Manyama, May 17 2021

Status

approved