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 A324820 Xor-Moebius transform of A324815. 4
 0, 0, 0, 4, 0, 2, 0, 12, 12, 0, 0, 2, 0, 2, 16, 16, 0, 4, 0, 0, 36, 0, 0, 0, 24, 0, 20, 6, 0, 50, 0, 56, 4, 0, 40, 44, 0, 2, 128, 0, 0, 38, 0, 0, 56, 0, 0, 8, 48, 10, 4, 0, 0, 4, 72, 4, 512, 2, 0, 34, 0, 0, 36, 72, 8, 6, 0, 4, 4, 40, 0, 100, 0, 0, 40, 6, 80, 130, 0, 8, 16, 0, 0, 22, 256, 0, 2048, 8, 0, 90, 128, 4 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 (based on Hans Havermann's factorization of A156552) FORMULA a(p) = 0 for all primes p. PROG (PARI) A156552(n) = {my(f = factor(n), p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res}; \\ From A156552 by David A. Corneth A324815(n) = bitand(2*A156552(n), A323243(n)); \\ Needs code also from A323243. A324820(n) = { my(v=0); fordiv(n, d, if(issquarefree(n/d), v=bitxor(v, A324815(d)))); (v); }; CROSSREFS Cf. A156552, A323243, A324815, A324821, A324878. Sequence in context: A272203 A324815 A019200 * A337996 A087604 A090538 Adjacent sequences:  A324817 A324818 A324819 * A324821 A324822 A324823 KEYWORD nonn AUTHOR Antti Karttunen, Mar 18 2019 STATUS approved

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Last modified June 25 04:07 EDT 2021. Contains 345451 sequences. (Running on oeis4.)