A019466 Multiply by 1, add 1, multiply by 2, add 2, etc.; start with 3.

3, 3, 4, 8, 10, 30, 33, 132, 136, 680, 685, 4110, 4116, 28812, 28819, 230552, 230560, 2075040, 2075049, 20750490, 20750500, 228255500, 228255511, 2739066132, 2739066144, 35607859872, 35607859885, 498510038390, 498510038404, 7477650576060, 7477650576075, 119642409217200

Offset

0,1

Links

Table of n, a(n) for n=0..31.

Prog

(PARI) A019466(n, a=3)={for(i=2, n+1, if(bittest(i, 0), a+=i\2, a*=i\2)); a} \\ M. F. Hasler, Feb 25 2018

Crossrefs

Cf. A082458 (same, but start with 0), A019464 (start with 1), A019465 (start with 2).

Cf. A019460 .. A019463 & A082448 (similar, but first add, then multiply).

Sequence in context: A327745 A155822 A160646 * A111573 A049854 A353265

Adjacent sequences: A019463 A019464 A019465 * A019467 A019468 A019469

Keyword

nonn

Author

N. J. A. Sloane

Extensions

Edited by M. F. Hasler, Feb 25 2018

Status

approved