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A036668
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Hati numbers: of form 2^i*3^j*k, i+j even, (k,6)=1.
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1
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1, 4, 5, 6, 7, 9, 11, 13, 16, 17, 19, 20, 23, 24, 25, 28, 29, 30, 31, 35, 36, 37, 41, 42, 43, 44, 45, 47, 49, 52, 53, 54, 55, 59, 61, 63, 64, 65, 66, 67, 68, 71, 73, 76, 77, 78, 79, 80, 81, 83, 85, 89, 91, 92, 95, 96, 97, 99, 100, 101, 102, 103, 107
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| If n appears then 2n and 3n do not. - Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 13 2002
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REFERENCES
| Don McDonald (dsmcdona(AT)actrix.gen.nz), Obituary of Alan Robert Boyd, posted to sci.math Jan 02 1999.
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PROG
| Contribution from Michael B. Porter (michael_b_porter(AT)yahoo.com), Mar 16 2010: (Start)
(PARI) twos(n) = {local(r, m); r=0; m=n; while(m%2==0, m=m/2; r++); r}
threes(n) = {local(r, m); r=0; m=n; while(m%3==0, m=m/3; r++); r}
isA036668(n) = (twos(n)+threes(n))%2==0 (End)
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CROSSREFS
| Cf. A007310, A036667.
Cf. A003159.
Sequence in context: A088685 A022299 A099049 * A192242 A010381 A095033
Adjacent sequences: A036665 A036666 A036667 * A036669 A036670 A036671
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), xpolakis(AT)hol.gr (Antreas P. Hatzipolakis)
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