A366261 The least number with the same prime signature as A366260, where A366260 is Doudna sequence permuted by May code.

1, 2, 4, 2, 4, 2, 6, 8, 16, 2, 6, 12, 6, 8, 4, 12, 24, 2, 6, 12, 6, 12, 6, 30, 24, 32, 4, 12, 36, 12, 16, 8, 16, 2, 6, 12, 6, 12, 6, 30, 24, 48, 6, 30, 60, 30, 24, 12, 60, 48, 4, 12, 36, 12, 36, 12, 60, 72, 64, 8, 24, 72, 24, 32, 64, 2, 6, 12, 6, 12, 6, 30, 24, 48, 6, 30, 60, 30, 24, 12, 60, 120, 6, 30, 60, 30, 60

Offset: 0

Author

Antti Karttunen, Oct 05 2023

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 0..16384
• Index entries for sequences related to binary expansion of n

Crossrefs

Cf. A005940, A046523, A303767, A366260, A366262 (rgs-transform).

Cf. also A278219, A278222.

Programs

PARI

A046523(n) = { my(f=vecsort(factor(n)[,2],,4),p);prod(i=1,#f,(p=nextprime(p+1))^f[i]) }
A366261(n) = A046523(A366260(n)); \\ Needs also the program given in A366260.

Formula

a(n) = A046523(A366260(n)).

a(n) = A278222(A303767(n)).

A001222(a(n)) = A366254(n).