OFFSET
1,1
LINKS
Jon E. Schoenfield, Table of n, a(n) for n = 1..100
FORMULA
a(1) = 1, a(n) = sum_{d | A002110(n-1)} moebius(d) * floor(prime(n)^3 / d). [Follows when A030514, prime(n)^4 is substituted to the similar formula given for A078898. Here A002110(n) gives the product of the first n primes. Because the latter is always squarefree, one could use here also Liouville's lambda (A008836) instead of Moebius mu (A008683).]
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 14 2014
EXTENSIONS
More terms from Jon E. Schoenfield, Dec 14 2014
STATUS
approved