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A309056
Where records of A309036 occur.
3
1, 4, 25, 26, 43, 77, 201, 336, 881, 2144, 22305, 24113, 44349, 48748, 153884, 400161, 793873, 1195455, 5066329, 6227954, 11394871, 16233979, 18368369, 63843903, 80998288, 117335658, 246252769, 6420049930, 23198011949, 30432298548, 62709861290, 117888644809
OFFSET
1,2
COMMENTS
Numbers m such that A309036(m) > A309036(k) for all k < m.
LINKS
FORMULA
A309055(n) = A309036(a(n)).
EXAMPLE
a(3) = 25 is a term because A309036(25) = 20 and A309036(k) < 20 for k < 25.
MAPLE
S1:= 0: S2:= 0: Recn:= 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;
Recn:= Recn, n;
fi
od:
Recn;
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(k, ", "))); } \\ Jinyuan Wang, Apr 16 2020
CROSSREFS
Sequence in context: A238515 A043067 A289273 * A095970 A297963 A020221
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