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A309055
Record values of A309036.
3
2, 17, 20, 43, 107, 142, 176, 1291, 1748, 3309, 5114, 9412, 13032, 53799, 62195, 258834, 515752, 590919, 1880056, 4387977, 4982469, 8725487, 10021836, 22701799, 34769113, 75672055, 3847032954, 6476460401, 8607624876, 13054048917, 40404144055, 55300901872
OFFSET
1,1
LINKS
FORMULA
a(n) = A309036(A309056(n)).
EXAMPLE
a(3) = 20 is a term because A309036(25) = 20 and A309036(k) < 20 for k < 25.
MAPLE
S1:= 0: S2:= 0: Recv:= NULL: count:= 0:
maxv:= 0:
for n from 1 to 200000 do
p:= ithprime(n);
S1:= S1 + p;
S2:= S2 + n*p;
v:= igcd(S1, S2);
if v > maxv then
maxv:= v;
count:= count+1;
Recv:= Recv, v;
fi
od:
Recv;
PROG
(PARI) lista(nn) = {my(k=r=s=t=0); forprime(p=2, nn, if(gcd(s+=p, t+=(k++)*p)>r, r=gcd(s, t); print1(r, ", "))); } \\ Jinyuan Wang, Apr 16 2020
CROSSREFS
Sequence in context: A042055 A075683 A340044 * A157191 A371478 A006029
KEYWORD
nonn
AUTHOR
Robert Israel, Jul 09 2019
EXTENSIONS
a(16)-a(27) from Rémy Sigrist, Jul 09 2019
a(28) from Jinyuan Wang, Apr 16 2020
Terms a(29) and beyond from Giovanni Resta, Apr 19 2020
STATUS
approved