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A278249
Least number with the prime signature of A000123(n), the number of partitions of 2n into powers of 2.
1
1, 2, 4, 6, 6, 6, 12, 6, 36, 6, 60, 6, 6, 30, 60, 6, 6, 30, 12, 210, 210, 180, 12, 30, 12, 30, 900, 60, 6, 6, 60, 30, 12, 210, 720, 30, 420, 30, 60, 6, 12, 30, 60, 6, 6, 60, 60, 30, 60, 210, 2520, 210, 210, 30, 180, 210, 60, 120, 60, 210, 6, 30, 60, 30, 6, 30, 60, 30, 6, 30, 12, 30, 60, 30, 420, 210, 60, 30, 420, 60, 6, 30, 2520, 30, 30, 210, 12, 210, 60, 210
OFFSET
0,2
LINKS
FORMULA
a(n) = A046523(A000123(n)).
PROG
(PARI)
A000123(n) = if(n<1, n==0, A000123(n\2)+A000123(n-1)); \\ From M. F. Hasler, Apr 30 2009 (?)
A046523(n) = my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]) \\ From Charles R Greathouse IV, Aug 17 2011
for(n=0, 321, write("b278249.txt", n, " ", A278249(n)));
(Scheme) (define (A278249 n) (A046523 (A000123 n)))
CROSSREFS
Cf. also A278241.
Sequence in context: A361689 A078611 A211376 * A339743 A131450 A114218
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 22 2016
STATUS
approved