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A353795 Numbers k such that k divides A353794(k), where A353794(n) = A003958(A003973(n)) * A064989(A003973(n)). 3
1, 4, 12, 24, 36, 44, 72, 96, 112, 132, 180, 220, 360, 384, 396, 400, 480, 560, 660, 784, 832, 864, 1044, 1056, 1188, 1200, 1344, 1920, 1980, 2088, 2352, 2376, 2496, 2800, 3168, 3600, 3920, 4320, 4736, 5220, 5280, 5376, 5824, 5940, 6800, 6912, 7056, 7200, 7488, 8400, 8800, 9504, 9900, 10000, 10440, 10800, 11484 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Of 2608 initial terms, only 188 are not in A353796. The first three of these are: 400, 784, 832.
LINKS
PROG
(PARI)
A003958(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1]--); factorback(f); };
A003961(n) = { my(f = factor(n)); for(i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; \\ From A003961
A064989(n) = { my(f=factor(n>>valuation(n, 2))); for(i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f); };
A353794(n) = { my(s=sigma(A003961(n))); (A003958(s)*A064989(s)); };
isA353795(n) = !(A353794(n)%n);
CROSSREFS
Cf. also A353796.
Sequence in context: A072389 A218391 A297568 * A317518 A307763 A071228
KEYWORD
nonn
AUTHOR
Antti Karttunen, May 12 2022
STATUS
approved

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Last modified May 21 22:16 EDT 2024. Contains 372741 sequences. (Running on oeis4.)