A062247 Let f(h) = A141900(h) = 2^h * 3^i * 5^j * ... be the smallest term in A141586 that is divisible by 2^h but not by 2^(h+1). Sequence gives values of h where i increases.

0, 2, 8, 24, 26, 48, 80, 120, 168, 242, 288, 360, 528, 728, 840, 960, 1330, 1368, 1680, 1848, 2186, 2208, 2808, 3480, 3720, 4488, 5040, 5328, 6240, 6560, 6888, 7920, 9408

Offset

1,2

Links

Table of n, a(n) for n=1..33.

Example

Pairs (h,i) where A141900 contains a term 2^h*3^i*... for the first time, with a dash if that value of i never occurs:
h i
0 0
2 1
- 2
8 3
24 4
26 5
48 6
80 7
- 8
120 9
168 10
242 11
288 12
360 13
528 14
728 15
840 16
960 17
1330 18
1368 19
1680 20
...
The missing values of i for h <= 10000 are 2, 8 and 26.

Crossrefs

Cf. A141586, A141900.

Sequence in context: A374364 A354176 A007346 * A284951 A357635 A171261

Adjacent sequences: A062244 A062245 A062246 * A062248 A062249 A062250

Keyword

nonn

Author

N. J. A. Sloane, Nov 24 2008

Status

approved