

A225891


Numbers obtained by rotating left the indices in the prime signature of n.


5



1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 18, 13, 14, 15, 16, 17, 12, 19, 50, 21, 22, 23, 54, 25, 26, 27, 98, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 250, 41, 42, 43, 242, 75, 46, 47, 162, 49, 20, 51, 338, 53, 24, 55, 686, 57, 58, 59, 150, 61, 62, 147, 64, 65, 66
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OFFSET

1,2


COMMENTS

The first term which is different from A105119 is a(60).
The first term which is different from A069799 is a(90).


LINKS



EXAMPLE

a(2250) = a(2*3^2*5^3) = 2^2*3^3*5 = 540.


MATHEMATICA

Table[Times @@ ((ar = Transpose[FactorInteger[n]])[[1]]^RotateLeft[ar[[2]]]), {n, 66}] (* Ivan Neretin, Jul 09 2015 *)


PROG

(PARI) { a(n)=my(f=factor(n), l=#f[, 1]);
return(prod(i=1, l, f[i, 1]^f[if(i==l, 1, i+1), 2])) }


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



