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A274282 Numbers that are a product of distinct numbers in A000285. 1
1, 4, 5, 9, 14, 20, 23, 36, 37, 45, 56, 60, 70, 92, 97, 115, 126, 148, 157, 180, 185, 207, 240, 254, 280, 300, 322, 333, 388, 411, 460, 485, 504, 518, 540, 628, 630, 665, 740, 785, 828, 840, 851, 873, 1016, 1035, 1076, 1200, 1270, 1288, 1332, 1358, 1380 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See the Comment on distinct-product sequences in A160009.

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

20 = 4*5, 180 = 4*5*9.

MATHEMATICA

f[1] = 1; f[2] = 4; z = 32; f[n_] := f[n - 1] + f[n - 2]; f = Table[f[n], {n, 1, z}]; f

s = {1}; Do[s = Union[s, Select[s*f[[i]], # <= f[[z]] &]], {i, z}]; s

CROSSREFS

Cf. A160009, A274288.

Sequence in context: A038099 A243166 A120740 * A000285 A042031 A041493

Adjacent sequences:  A274279 A274280 A274281 * A274283 A274284 A274285

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 17 2016

STATUS

approved

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Last modified October 19 16:41 EDT 2018. Contains 316367 sequences. (Running on oeis4.)