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A326302 a(n) = lcm(n, r(n)) where r(n) = A030101(n) corresponds to the binary reversal of n. 1
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 143, 12, 143, 14, 15, 16, 17, 18, 475, 20, 21, 286, 667, 24, 475, 286, 27, 28, 667, 30, 31, 32, 33, 34, 245, 36, 1517, 950, 741, 40, 1517, 42, 2279, 572, 45, 1334, 2867, 48, 245, 950, 51, 572, 2279, 54, 3245, 56, 741, 1334, 3245 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..8192

FORMULA

a(n) >= n with equality iff n belongs to A057890.

a(n) < A062383(n)*n. - Robert Israel, Oct 17 2019

EXAMPLE

For n = 35:

- the binary reversal of 35 ("100011" in binary) is 49 ("110001" in binary),

- hence a(35) = lcm(35, 49) = lcm(5*7, 7^2) = 5*7^2 = 245.

MAPLE

f:= proc(n) local L, j;

  L:= convert(n, base, 2);

  ilcm(n, add(2^(j-1)*L[-j], j=1..nops(L)))

end proc:

map(f, [$0..100]);

PROG

(PARI) a(n, base=2) = lcm(n, fromdigits(Vecrev(digits(n, base)), base))

CROSSREFS

Cf. A030101, A057890 (fixed points), A161825 (GCD variant), A068634 (decimal variant).

Cf. A062383.

Sequence in context: A061378 A004872 A078295 * A004883 A004894 A004905

Adjacent sequences:  A326299 A326300 A326301 * A326303 A326304 A326305

KEYWORD

nonn,base,look

AUTHOR

Rémy Sigrist, Oct 17 2019

STATUS

approved

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Last modified September 28 22:03 EDT 2020. Contains 337417 sequences. (Running on oeis4.)