OFFSET
1,1
COMMENTS
Generalized harmonic numbers are defined as H(m,k) = Sum_{i=1..m} 1/i^k. Alternating generalized harmonic numbers are defined as H'(m,k) = Sum_{i=1..m} (-1)^(i+1)*1/i^k.
a(18)..a(24) = {77,104,77,136,104,370,136}. a(26)..a(27) = {77,104}.
LINKS
Eric Weisstein's World of Mathematics, Harmonic Number
FORMULA
a(n) = A128670(prime(n)).
EXAMPLE
a(2) = A128673(1) = 94556602.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Alexander Adamchuk, Mar 24 2007, Mar 26 2007
EXTENSIONS
a(9) = 2948 and a(12) = 1752 from Max Alekseyev
Edited by Max Alekseyev, Feb 20 2019
STATUS
approved