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A114797 a(n) = n multiplied by the least nontrivial nondivisor of n. 1
6, 12, 10, 24, 14, 24, 18, 30, 22, 60, 26, 42, 30, 48, 34, 72, 38, 60, 42, 66, 46, 120, 50, 78, 54, 84, 58, 120, 62, 96, 66, 102, 70, 180, 74, 114, 78, 120, 82, 168, 86, 132, 90, 138, 94, 240, 98, 150, 102, 156, 106, 216, 110, 168, 114, 174, 118, 420, 122, 186, 126, 192 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

COMMENTS

a(2n-1) = 4n-2. a(n!) = p*n! where p is the least prime > n, because all the number from n+1, n+2 up to p-1 would divide n!.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 3..1000

EXAMPLE

a(24) = 24*5 = 120 as 2,3,4 divide 24.

MATHEMATICA

Do[l = Range[1, n]; m = Divisors[n]; s = Complement[l, m]; Print[n * Min[s]], {n, 3, 100}] (* Ryan Propper, Jul 21 2006 *)

# First[Complement[Range[#], Divisors[#]]]&/@Range[3, 70] (* Harvey P. Dale, Dec 27 2012 *)

CROSSREFS

Sequence in context: A236926 A134383 A272305 * A048726 A092461 A102809

Adjacent sequences:  A114794 A114795 A114796 * A114798 A114799 A114800

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Nov 20 2005

EXTENSIONS

More terms from Ryan Propper, Jul 21 2006

STATUS

approved

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Last modified March 21 21:34 EDT 2019. Contains 321382 sequences. (Running on oeis4.)