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A036305 Composite numbers n such that digits of prime factors of n are either 1 or 5. 2
25, 55, 121, 125, 275, 605, 625, 755, 1331, 1375, 1661, 3025, 3125, 3775, 5755, 6655, 6875, 7555, 8305, 12661, 14641, 15125, 15625, 16621, 18271, 18875, 22801, 28775, 33275, 34375, 37775, 41525, 57755, 63305, 73205, 75625, 77555, 77755, 78125 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are a product of at least two terms of A020453. - David A. Corneth, Oct 09 2020

LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000 (first 1000 terms from Alois P. Heinz)

Index entries for sequences related to prime factors

CROSSREFS

Cf. A003598, A020453, A036302-A036325.

Sequence in context: A080863 A091214 A338009 * A257708 A266817 A125827

Adjacent sequences:  A036302 A036303 A036304 * A036306 A036307 A036308

KEYWORD

nonn,easy,base

AUTHOR

Patrick De Geest, Dec 15 1998

STATUS

approved

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Last modified November 27 06:19 EST 2020. Contains 338678 sequences. (Running on oeis4.)