A286448 Restricted growth sequence computed for A252748 (= A003961(n) - 2*n).

1, 1, 1, 2, 3, 4, 3, 5, 6, 2, 7, 8, 7, 9, 9, 10, 11, 12, 11, 13, 14, 15, 16, 17, 1, 1, 18, 19, 20, 21, 22, 23, 1, 24, 6, 25, 26, 27, 6, 28, 29, 30, 29, 31, 32, 15, 33, 34, 13, 35, 27, 10, 36, 37, 38, 39, 2, 40, 41, 42, 43, 44, 45, 46, 24, 47, 48, 49, 6, 50, 51, 52, 53, 22, 54, 55, 24, 56, 57, 58, 59, 60, 61, 62, 63, 64, 38, 65, 66, 67, 9, 68, 1, 69, 69, 70

Offset: 1

Author

Antti Karttunen, May 13 2017

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A003961, A252748, A286449, A286450.

Programs

PARI

rgs_transform(invec) = { my(occurrences = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(occurrences,invec[i]), my(pp = mapget(occurrences, invec[i])); outvec[i] = outvec[pp] , mapput(occurrences,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
A252748(n) = (A003961(n) - (2*n));
write_to_bfile(1,rgs_transform(vector(10000,n,A252748(n))),"b286448.txt");