A392495 3-rigid numbers. p-rigid numbers where p is prime are defined in A392499.

45, 105, 165, 189, 195, 255, 285, 441, 567, 693, 735, 819, 825, 1071, 1275, 1287, 1323, 1449, 1683, 1701, 1815, 1827, 1911, 2175, 2325, 2535, 2541, 2709, 2775, 3075, 3087, 3339, 3525, 3717, 3843, 3975, 4221, 4335, 4473, 4575, 5025, 5103, 5229, 5325, 5475, 5607

Offset

1,1

Links

Table of n, a(n) for n=1..46.

Peter Luschny, Composable, rigid, and sparse numbers. A Python notebook.

Prog

(Python) # Function 'is_rigid' is defined in A392499 (see also links).
def A392495_list(upto: int) -> list[int]:
    return [n for n in range(45, upto+1, 3) if 3 == is_rigid(n)]
print(A392495_list(5608))

Crossrefs

Cf. A392499, A392496 (p=2).

Sequence in context: A067828 A144552 A068355 * A331190 A332593 A144486

Adjacent sequences: A392492 A392493 A392494 * A392496 A392497 A392498

Keyword

nonn

Author

Peter Luschny, Jan 15 2026

Status

approved