cp's OEIS Frontend

A359600 The least odd number with the same prime signature as n.

%I A359600 #15 Jan 12 2023 16:26:30
%S A359600 1,3,3,9,3,15,3,27,9,15,3,45,3,15,15,81,3,45,3,45,15,15,3,135,9,15,27,
%T A359600 45,3,105,3,243,15,15,15,225,3,15,15,135,3,105,3,45,45,15,3,405,9,45,
%U A359600 15,45,3,135,15,135,15,15,3,315,3,15,45,729,15,105,3,45,15,105,3,675,3,15,45,45,15,105,3,405,81
%N A359600 The least odd number with the same prime signature as n.
%F A359600 a(n) = A003961(A046523(n)).
%p A359600 a:= n-> (l-> mul(ithprime(i+1)^l[i][2], i=1..nops(l)))
%p A359600         (sort(ifactors(n)[2], (x, y)->x[2]>y[2])):
%p A359600 seq(a(n), n=1..100);  # _Alois P. Heinz_, Jan 12 2023
%o A359600 (PARI) a(n) = { my(f=vecsort(factor(n)[, 2], , 4)); prod(i=1, #f, prime(i+1)^f[i]) } \\ _Andrew Howroyd_, Jan 12 2023
%o A359600 (Python)
%o A359600 from math import prod
%o A359600 from sympy import prime, factorint
%o A359600 def A359600(n): return prod(prime(i)**e for i, e in enumerate(sorted(factorint(n).values(), reverse=True),2)) # _Chai Wah Wu_, Jan 12 2023
%Y A359600 Cf. A003961, A046523, A101296.
%Y A359600 Cf. also A278223.
%K A359600 nonn
%O A359600 1,2
%A A359600 _Antti Karttunen_, Jan 12 2023