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A304431 a(n+1) = 1 + min( 2*a(floor(n/2)), 3*a(floor(n/3)) ), with a(0) = 0. 0
0, 1, 1, 1, 3, 3, 3, 3, 3, 4, 4, 4, 4, 7, 7, 7, 7, 7, 7, 9, 9, 9, 9, 9, 9, 9, 9, 10, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 21, 21, 22, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Same recursion as Knuth numbers A007448 but different initial value.

LINKS

Table of n, a(n) for n=0..71.

PROG

(PARI) {a(n) = if( n<1, 0, n--; 1 + min( a(n\2)*2, a(n\3)*3 ))};

CROSSREFS

Cf. A007448.

Sequence in context: A176873 A227727 A050499 * A147752 A236682 A114227

Adjacent sequences:  A304428 A304429 A304430 * A304432 A304433 A304434

KEYWORD

nonn

AUTHOR

Michael Somos, May 12 2018

STATUS

approved

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Last modified June 17 21:47 EDT 2019. Contains 324200 sequences. (Running on oeis4.)