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A097273 Least integer with each "mod 2 prime signature". 3
1, 2, 3, 4, 6, 8, 9, 12, 15, 16, 18, 24, 27, 30, 32, 36, 45, 48, 54, 60, 64, 72, 81, 90, 96, 105, 108, 120, 128, 135, 144, 162, 180, 192, 210, 216, 225, 240, 243, 256, 270, 288, 315, 324, 360, 384, 405, 420, 432, 450, 480, 486, 512, 540, 576, 630, 648, 675, 720 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

For n=2^a_0*p_1^a_1*...*p_n^a_n where p_i is odd prime and a_1>=a_2>=...>=a_n, define "mod 2 prime signature" to be ordered prime exponents (a_0,a_1,...,a_n).

Least integer with a given mod 2 prime signature is obtained by replacing p_1 with 3, p_2 with 5,..., p_n with n-th odd prime.

A097272 sorted and duplicates removed; n such that A097272(n)=n.

LINKS

Table of n, a(n) for n=0..58.

CROSSREFS

Cf. A097272, A097274, A097275.

Sequence in context: A033501 A231404 A316860 * A006446 A261342 A002348

Adjacent sequences:  A097270 A097271 A097272 * A097274 A097275 A097276

KEYWORD

nonn

AUTHOR

Ray Chandler, Aug 22 2004

STATUS

approved

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Last modified October 22 03:04 EDT 2019. Contains 328315 sequences. (Running on oeis4.)