A329202 a(n) = floor(2*log_2(n)) = floor(log_2(n^2)).

0, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12

Offset: 1

Author

M. F. Hasler, Nov 07 2019

Keywords

• nonn
• easy

Crossrefs

Cf. A017912, A328911 (has this as row lengths).

Programs

PARI

a(n)=logint(n^2,2)