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A036327 Composite numbers n such that juxtaposition of prime factors of n has length 3. 2
8, 12, 18, 20, 22, 26, 27, 28, 30, 33, 34, 38, 39, 42, 45, 46, 50, 51, 55, 57, 58, 62, 63, 65, 69, 70, 74, 75, 77, 82, 85, 86, 87, 91, 93, 94, 95, 98, 105, 106, 111, 115, 118, 119, 122, 123, 125, 129, 133, 134, 141, 142, 145, 146, 147, 155, 158, 159, 161, 166, 175 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The last term is a(104)=679.

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..104 (full sequence)

MAPLE

isA036327 := proc(n) local d: d:=ifactors(n)[2]: return `if`(not isprime(n) and add(length(d[j][1])*d[j][2], j=1..nops(d))=3, n, NULL): end: seq(isA036327(n), n=2..999); # Nathaniel Johnston, Jun 22 2011

CROSSREFS

Cf. A036326-A036334.

Sequence in context: A091523 A257162 A104201 * A051144 A067537 A046339

Adjacent sequences:  A036324 A036325 A036326 * A036328 A036329 A036330

KEYWORD

nonn,base,easy,fini,full

AUTHOR

Patrick De Geest, Dec 15 1998

STATUS

approved

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Last modified January 17 11:57 EST 2021. Contains 340240 sequences. (Running on oeis4.)