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A064615 Numbers of the form m * 6^k for k >= 0 and m > 0 with gcd(m, 6) = 1. 2
1, 5, 6, 7, 11, 13, 17, 19, 23, 25, 29, 30, 31, 35, 36, 37, 41, 42, 43, 47, 49, 53, 55, 59, 61, 65, 66, 67, 71, 73, 77, 78, 79, 83, 85, 89, 91, 95, 97, 101, 102, 103, 107, 109, 113, 114, 115, 119, 121, 125, 127, 131, 133, 137, 138, 139, 143, 145, 149, 150, 151, 155 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

These are the fixed points of A064614, a permutation of natural numbers: A064614(a(n)) = a(n), for all n.

Numbers n such that exponent of highest power of 2 dividing n is equal to exponent of highest power of 3 dividing n. - Juri-Stepan Gerasimov, Sep 01 2016

All primes >3 are terms. - Zak Seidov, Sep 02 2016

LINKS

Table of n, a(n) for n=1..62.

FORMULA

a(n) = 5n/2 + O(log n). - Charles R Greathouse IV, Sep 02 2016

PROG

(PARI) is(n)=valuation(n, 2)==valuation(n, 3) \\ Charles R Greathouse IV, Sep 02 2016

(MAGMA) [n: n in [1..200] |Valuation(n, 2) eq Valuation(n, 3)]; // Vincenzo Librandi, Sep 02 2016

CROSSREFS

Cf. A064614.

Sequence in context: A073936 A184811 A230995 * A300957 A139205 A288859

Adjacent sequences:  A064612 A064613 A064614 * A064616 A064617 A064618

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 25 2001

STATUS

approved

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Last modified May 27 03:03 EDT 2020. Contains 334647 sequences. (Running on oeis4.)