A323246 Lexicographically earliest sequence such that for all i, j, a(i) = a(j) => f(i) = f(j), where f(n) = A323248(n) for n > 1, and f(1) = -1.

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

Offset

1,2

Links

Antti Karttunen, Table of n, a(n) for n = 1..4096

Prog

(PARI)
up_to = 1024;
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; };
A064989(n) = {my(f); f = factor(n); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f)};
A156552(n) = if(1==n, 0, if(!(n%2), 1+(2*A156552(n/2)), 2*A156552(A064989(n))));
A323244(n) = if(1==n, 0, my(k=A156552(n)); (2*k)-sigma(k));
A323248(n) = (A323244(n) - bigomega(n));
A323246aux(n) = if(1==n, -1, A323248(n));
v323246 = rgs_transform(vector(up_to, n, A323246aux(n)));
A323246(n) = v323246[n];

Crossrefs

Cf. A323248.

Sequence in context: A174931 A058744 A366297 * A364721 A185617 A250268

Adjacent sequences: A323243 A323244 A323245 * A323247 A323248 A323249

Keyword

nonn

Author

Antti Karttunen, Jan 10 2019

Status

approved