A117796 Enneagonal numbers divisible by 9.

0, 9, 261, 396, 1089, 1350, 2484, 2871, 4446, 4959, 6975, 7614, 10071, 10836, 13734, 14625, 17964, 18981, 22761, 23904, 28125, 29394, 34056, 35451, 40554, 42075, 47619, 49266, 55251, 57024, 63450, 65349, 72216, 74241, 81549, 83700, 91449

Offset

1,2

Comments

Intersection of A008591 and A001106. - Michel Marcus, Feb 27 2014

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Mathematica

Select[Table[PolygonalNumber[9, n], {n, 0, 170}], Divisible[#, 9] &] (* Amiram Eldar, Mar 22 2021 *)

Prog

(PARI) isok(n) = ispolygonal(n, 9) && !(n % 9); \\ Michel Marcus, Feb 27 2014

Crossrefs

Cf. A001106, A008591.

Sequence in context: A001823 A229259 A376096 * A117051 A173985 A280178

Adjacent sequences: A117793 A117794 A117795 * A117797 A117798 A117799

Keyword

easy,nonn

Author

Luc Stevens (lms022(AT)yahoo.com), Apr 29 2006

Status

approved