A392495 - OEIS

%I #9 Mar 03 2026 03:59:22

%S 45,105,165,189,195,255,285,441,567,693,735,819,825,1071,1275,1287,

%T 1323,1449,1683,1701,1815,1827,1911,2175,2325,2535,2541,2709,2775,

%U 3075,3087,3339,3525,3717,3843,3975,4221,4335,4473,4575,5025,5103,5229,5325,5475,5607

%N 3-rigid numbers. p-rigid numbers where p is prime are defined in A392499.

%H Peter Luschny, <a href="https://github.com/PeterLuschny/Gists/blob/main/ComposableRigidSparse.ipynb">Composable, rigid, and sparse numbers</a>. A Python notebook.

%o (Python) # Function 'is_rigid' is defined in A392499 (see also links).

%o def A392495_list(upto: int) -> list[int]:

%o     return [n for n in range(45, upto+1, 3) if 3 == is_rigid(n)]

%o print(A392495_list(5608))

%Y Cf. A392499, A392496 (p=2).

%K nonn

%O 1,1

%A _Peter Luschny_, Jan 15 2026