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A359544
Numbers k such that all their divisors (including k itself) are in A099308, i.e., reach eventually zero when iterated with the arithmetic derivative.
4
1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 17, 18, 19, 21, 22, 23, 25, 29, 31, 33, 34, 37, 38, 41, 42, 43, 46, 47, 49, 53, 57, 58, 59, 61, 62, 65, 66, 67, 71, 73, 77, 79, 82, 83, 85, 89, 93, 94, 97, 98, 101, 103, 107, 109, 113, 114, 118, 121, 127, 129, 131, 137, 139, 142, 145, 149, 151, 154, 157, 161, 163, 166
OFFSET
1,2
EXAMPLE
30 = 2*3*5, although it is in A099308, is not included here because its divisor 15 is not in A099308.
PROG
(PARI) isA359544(n) = A359543(n);
CROSSREFS
Positions of 0's in A359542.
Setwise difference A099308 \ A359545.
Cf. A359543 (characteristic function).
Sequence in context: A065896 A358215 A099308 * A074235 A325366 A192189
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 05 2023
STATUS
approved