

A098486


Odd numbers with replacement of all prime factors 3 by 2.


3



1, 2, 5, 7, 4, 11, 13, 10, 17, 19, 14, 23, 25, 8, 29, 31, 22, 35, 37, 26, 41, 43, 20, 47, 49, 34, 53, 55, 38, 59, 61, 28, 65, 67, 46, 71, 73, 50, 77, 79, 16, 83, 85, 58, 89, 91, 62, 95, 97, 44, 101, 103, 70, 107, 109, 74, 113, 115, 52, 119, 121, 82, 125, 127, 86, 131, 133
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OFFSET

1,2


COMMENTS

This sequence occurred in an analysis of A098003, see link.


LINKS

Ivan Neretin, Table of n, a(n) for n = 1..10000
Keith Ramsay, Recursively Rotated Permutation. Posting in newsgroup sci.math, Sep 10 2004


EXAMPLE

a(8): The 8th odd number is 15=3*5. Replace factor 3 by 2: a(8)=2*5=10.


MATHEMATICA

Table[(2 n  1)*(2/3)^IntegerExponent[2 n  1, 3], {n, 67}] (* Ivan Neretin, Mar 05 2016 *)


PROG

(PARI) lista(nn) = {forstep(n=1, nn, 2, newn = if (np = valuation(n, 3), n*2^np/3^np, n); print1(newn, ", "); ); } \\ Michel Marcus, Mar 06 2016


CROSSREFS

Cf. A098003, A005408.
Sequence in context: A296567 A205113 A349047 * A138320 A199275 A135007
Adjacent sequences: A098483 A098484 A098485 * A098487 A098488 A098489


KEYWORD

easy,nonn


AUTHOR

Hugo Pfoertner, Sep 10 2004


STATUS

approved



