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A036312 Composite numbers n such that digits of prime factors of n are either 2 or 7. +0
2
4, 8, 14, 16, 28, 32, 49, 56, 64, 98, 112, 128, 196, 224, 256, 343, 392, 448, 454, 512, 554, 686, 784, 896, 908, 1024, 1108, 1372, 1454, 1568, 1589, 1792, 1816, 1939, 2048, 2216, 2401, 2744, 2908, 3136, 3178, 3584, 3632, 3878, 4096, 4432, 4802, 5089, 5488 (list; graph; listen)
OFFSET

1,1

CROSSREFS

Cf. A003591, A036302-A036325.

Sequence in context: A138634 A125495 A114971 this_sequence A024805 A008579 A022804

Adjacent sequences: A036309 A036310 A036311 this_sequence A036313 A036314 A036315

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Dec 15 1998.

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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