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A324398 a(1) = 0; for n > 1, a(n) = A318458(A156552(n)). 12
0, 0, 0, 1, 0, 1, 0, 1, 6, 0, 0, 1, 0, 1, 8, 9, 0, 1, 0, 1, 16, 1, 0, 1, 0, 1, 10, 1, 0, 1, 0, 1, 0, 1, 20, 9, 0, 1, 66, 1, 0, 1, 0, 1, 6, 1, 0, 1, 0, 0, 2, 1, 0, 1, 36, 1, 258, 1, 0, 1, 0, 1, 6, 41, 0, 1, 0, 1, 0, 1, 0, 17, 0, 1, 16, 1, 32, 1, 0, 1, 10, 1, 0, 1, 132, 1, 1026, 1, 0, 33, 72, 1, 0, 1, 256, 25, 0, 0, 66, 17, 0, 1, 0, 1, 34 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,9
LINKS
FORMULA
a(1) = 0; for n > 1, a(n) = A318458(A156552(n)).
a(n) = A156552(n) AND (A323243(n) - A156552(n)).
PROG
(PARI)
A064989(n) = {my(f); f = factor(n); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f)};
A156552(n) = if(1==n, 0, if(!(n%2), 1+(2*A156552(n/2)), 2*A156552(A064989(n))));
A318458(n) = bitand(n, sigma(n)-n);
A324398(n) = if(1==n, 0, A318458(A156552(n)));
CROSSREFS
Sequence in context: A354883 A343956 A324878 * A171916 A325740 A222118
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 05 2019
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)