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A036307 Composite numbers n such that digits of prime factors of n are either 1 or 7. 2
49, 77, 119, 121, 187, 289, 343, 497, 539, 781, 833, 847, 1207, 1309, 1331, 2023, 2057, 2401, 3179, 3479, 3773, 4913, 5041, 5467, 5831, 5929, 7819, 8197, 8449, 8591, 9163, 9317, 12287, 12439, 12881, 13277, 14161, 14399, 14641, 16807, 18989, 19547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

CROSSREFS

Cf. A003599, A036302-A036325.

Sequence in context: A038510 A063163 A103216 * A294028 A056938 A267986

Adjacent sequences:  A036304 A036305 A036306 * A036308 A036309 A036310

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Dec 15 1998.

STATUS

approved

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Last modified October 22 11:13 EDT 2018. Contains 316438 sequences. (Running on oeis4.)