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A075457 Integer averages of first n perfect powers for some n. 0
1, 198, 1070, 2574, 10769, 66908, 1036663, 6436241, 12745650, 2253183029, 81422343214, 278747505724, 352663623088, 537668537432, 807810573770, 3169762558125, 3623176921864, 4225712901909, 4395991005975, 15435175116616, 1361811565229752 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
198 is average of first n=33 perfect powers, 1070 (n=73), 2574 (n=111), 10769 (n=219), 66908 (n=519), 1036663 (n=1943).
PROG
(PARI) lista(nn) = {vec = vector(nn, i, i); pp = concat(1, select(i->ispower(i) , vec)); s = 0; for (i = 1, #pp, s += pp[i]; if ((s % i) == 0, print1(s/i, ", ")); ); } \\ Michel Marcus, Oct 02 2013
CROSSREFS
Cf. A001597.
Sequence in context: A156771 A065697 A159204 * A364860 A224452 A227705
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Oct 11 2002
EXTENSIONS
Extended by Robert G. Wilson v, Oct 14 2002
a(8)-a(21) from Donovan Johnson, Oct 05 2013
STATUS
approved

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Last modified May 18 15:24 EDT 2024. Contains 372664 sequences. (Running on oeis4.)