A293217 Restricted growth sequence transform of A293216, where A293216(n) = Product_{d|n, d<n} A260443(d).

1, 2, 2, 3, 2, 4, 2, 5, 6, 7, 2, 8, 2, 9, 10, 11, 2, 12, 2, 13, 14, 15, 2, 16, 4, 8, 17, 18, 2, 19, 2, 20, 21, 22, 17, 23, 2, 13, 24, 25, 2, 26, 2, 27, 28, 29, 2, 30, 31, 32, 33, 34, 2, 35, 36, 37, 38, 39, 2, 40, 2, 41, 42, 43, 44, 45, 2, 46, 47, 48, 2, 49, 2, 27, 50, 51, 44, 52, 2, 53, 54, 55, 2, 56, 57, 58, 59, 60, 2, 61, 62, 63, 64, 65, 66, 67, 2, 68, 69

Offset

1,2

Comments

For all i, j: a(i) = a(j) => A001065(i) = A001065(j).

Links

Antti Karttunen, Table of n, a(n) for n = 1..16384

Prog

(PARI)
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])); }
A003961(n) = my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); \\ This function from Michel Marcus
A260443(n) = if(n<2, n+1, if(n%2, A260443(n\2)*A260443(n\2+1), A003961(A260443(n\2))));
A293216(n) = { my(m=1); fordiv(n, d, if(d < n, m *= A260443(d))); m; };
write_to_bfile(1, rgs_transform(vector(16384, n, A293216(n))), "b293217.txt");

Crossrefs

Cf. A001065, A260443, A293216, A293215 (a variant).

Sequence in context: A351235 A300233 A353523 * A329351 A319709 A293226

Adjacent sequences: A293214 A293215 A293216 * A293218 A293219 A293220

Keyword

nonn

Author

Antti Karttunen, Oct 03 2017

Status

approved