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A255424 Squarefree kernel of A255334: a(n) = A007947(A255334(n)). 6
42, 210, 462, 546, 714, 798, 966, 210, 1218, 78, 1302, 1554, 1722, 1806, 1974, 2226, 2310, 2478, 2562, 2730, 2814, 2982, 3066, 3318, 3486, 3570, 3738, 3990, 4074, 4242, 4326, 4494, 4578, 4746, 4830, 462, 210, 5334, 5502, 5754, 5838, 6006, 6090, 390, 6258, 6342, 6510, 6594, 6846, 7014, 546, 7266, 7518, 7602, 7770, 7854, 8022, 8106, 8274, 8358, 8610 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Sequence gives value of A007947(n) for numbers n for which there exists k > n such that A000203(k) = A000203(n) and A007947(k) = A007947(n), where A000203 gives the sum of divisors, and A007947 gives the squarefree kernel of n. The sequence is ordered according to the magnitude of n, and contains duplicates, because there are cases of multiple such pairs having same squarefree kernel.
The first duplicate occurs as a(2) = a(8) = 210.
LINKS
FORMULA
a(n) = A007947(A255334(n)).
a(n) = A007947(A255423(n)). [Equally, squarefree kernel of A255423(n).]
PROG
(Scheme) (define (A255424 n) (A007947 (A255334 n)))
CROSSREFS
Sequence in context: A236278 A236271 A008446 * A122232 A193392 A193400
KEYWORD
nonn
AUTHOR
Antti Karttunen, Apr 06 2015
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)