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A305434 Restricted growth sequence transform of A285713, formed from the prime signature of A245612(n). 4
1, 2, 2, 2, 3, 2, 4, 5, 2, 6, 3, 5, 2, 6, 2, 3, 3, 2, 6, 6, 2, 3, 3, 2, 6, 7, 2, 3, 8, 6, 2, 2, 3, 3, 9, 2, 2, 10, 3, 11, 6, 2, 12, 7, 3, 3, 9, 3, 3, 9, 2, 13, 3, 2, 6, 14, 3, 9, 2, 3, 6, 3, 6, 5, 3, 3, 12, 11, 3, 11, 3, 2, 7, 15, 3, 3, 7, 16, 2, 3, 2, 3, 3, 3, 2, 9, 3, 10, 3, 3, 6, 12, 3, 6, 3, 3, 17, 6, 3, 9, 6, 6, 2, 2, 3, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
PROG
(PARI)
A003961(n) = my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); \\ From A003961
A048673(n) = (A003961(n)+1)/2;
A254049(n) = A048673((2*n)-1);
A245612(n) = if(n<2, 1+n, if(!(n%2), (3*A245612(n/2))-1, A254049(A245612((n-1)/2))));
A046523(n) = { my(f=vecsort(factor(n)[, 2], , 4), p); prod(i=1, #f, (p=nextprime(p+1))^f[i]); }; \\ From A046523
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; };
v305434 = rgs_transform(vector(65538, n, A285713(n-1)));
A305434(n) = v305434[1+n];
CROSSREFS
Cf. also A305433.
Sequence in context: A273784 A318058 A345901 * A319478 A341408 A104239
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 01 2018
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)