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A036302 Composite numbers n such that digits of prime factors of n are either 1 or 2. 25
4, 8, 16, 22, 32, 44, 64, 88, 121, 128, 176, 242, 256, 352, 422, 484, 512, 704, 844, 968, 1024, 1331, 1408, 1688, 1936, 2048, 2321, 2662, 2816, 3376, 3872, 4096, 4222, 4442, 4642, 5324, 5632, 6752, 7744, 8192, 8444, 8884, 9284, 10648, 11264, 13504, 14641 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[2, 14650], !PrimeQ[#] && Complement[Flatten[IntegerDigits[First/@FactorInteger[#]]], {1, 2}]=={} &] (* Jayanta Basu, May 25 2013 *)

CROSSREFS

Cf. A003596, A036303-A036325.

Sequence in context: A194701 A220501 A053688 * A032377 A133690 A097057

Adjacent sequences:  A036299 A036300 A036301 * A036303 A036304 A036305

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Dec 15 1998.

STATUS

approved

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Last modified May 27 11:14 EDT 2017. Contains 287204 sequences.