OFFSET
1,4
COMMENTS
a(n) = 1 iff n is prime or n is 1.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65536
PROG
(PARI)
allocatemem(2^30);
up_to = 65536;
rgs_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(om, invec[i]), my(pp = mapget(om, invec[i])); outvec[i] = outvec[pp] , mapput(om, invec[i], i); outvec[i] = u; u++ )); outvec; };
write_to_bfile(start_offset, vec, bfilename) = { for(n=1, length(vec), write(bfilename, (n+start_offset)-1, " ", vec[n])); }
A083722(n) = { if(n==1, return (1)); my(gpf = vecmax(factor(n)[, 1])); my(pp = 1); forprime(p=gpf+1, n, pp *= p; ); pp; } \\ This function from Michel Marcus, Jun 26 2016
write_to_bfile(1, rgs_transform(vector(up_to, n, A083722(n))), "b293892.txt");
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 02 2017
STATUS
approved