A323046 Numbers that are neither 3-smooth nor a sum of two 3-smooth numbers.

23, 46, 47, 53, 61, 69, 71, 77, 79, 92, 94, 95, 101, 103, 106, 107, 115, 119, 121, 122, 125, 127, 133, 138, 139, 141, 142, 143, 149, 151, 154, 157, 158, 159, 161, 167, 169, 173, 175, 179, 181, 183, 184, 185, 187, 188, 190, 191, 197, 199, 202, 203, 205, 206, 207, 211, 212, 213, 214, 215, 221, 223, 227, 229, 230, 231, 233

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

23 is not in A003586; also 22 (23-1), 21 (23-2), 20 (23-3), 19 (23-2*2), 17 (23-2*3), 15 (23-2*2*2), 14 (23-3*3), 11 (23-2*2*3), 7 (23-2*2*2*2), 5 (23-2*3*3) are not in A003586.

Maple

N:= 1000: # to get all terms <= N
S:= {seq(seq(2^i*3^j, i=0..ilog2(N/3^j)), j=0..floor(log[3](N)))}:
sort(convert({$1..N} minus S minus map(t -> op(map(`+`, S, t)), S), list)); # Robert Israel, May 19 2019

Crossrefs

Cf. A003586, A237442, A323047, A323049, A323050. Subsequence of A081329.

Sequence in context: A266706 A040506 A081329 * A025022 A260750 A094694

Adjacent sequences: A323043 A323044 A323045 * A323047 A323048 A323049

Keyword

nonn

Author

Carlos Alves, Jan 03 2019

Status

approved