A104321 Smallest number m such that A104320(m)=n.

0, 5, 8, 18, 13, 26, 27, 23, 42, 25, 37, 58, 47, 46, 61, 67, 54, 71, 77, 73, 88, 99, 141, 100, 115, 114, 119, 117, 113, 112, 109, 135, 110, 127, 133, 136, 164, 162, 177, 186, 193, 195, 163, 189, 201, 196, 191, 199, 206, 188, 208, 200, 221, 266, 235, 234, 238, 280

Offset: 0

Author

Reinhard Zumkeller, Mar 01 2005

Keywords

• nonn

Comments

A104320(a(n))=n and A104320(m)<>n for m

If it exists, a(115) > 10^5. - Michel Marcus, Oct 19 2016

Links

• Michel Marcus, Table of n, a(n) for n = 0..114

Crossrefs

Cf. A036462, A060035, A104320, A375472.

Programs

PARI

a(n) = {my(k = 0); while (#select(x->(x==0), digits(2^k, 3)) != n, k++); k;} \\ Michel Marcus, Oct 19 2016

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