OFFSET
1,2
COMMENTS
For n>1, a(n) is a multiple of 24.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
EXAMPLE
120 has the prime factorization of 2^3 * 3^1 * 5^1. The distinct primes dividing 120 are therefore 2,3,5. (2-1)*(2+1)=3, (3-1)*(3+1)=8 and (5-1)*(5+1)=24 all divide 120. So 120 is included in the sequence.
MATHEMATICA
fQ[n_] := Block[{p = First /@ FactorInteger@ n}, Union@ Mod[n, (p - 1) (p + 1)] == {0}]; Select[ Range[2, 3000], fQ@# &] (* Robert G. Wilson v, May 25 2009 *)
PROG
(Haskell)
a141767 n = a141767_list !! (n-1)
a141767_list = filter f [1..] where
f x = all (== 0) $
map (mod x) $ zipWith (*) (map pred ps) (map succ ps)
where ps = a027748_row x
-- Reinhard Zumkeller, Aug 27 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Jul 02 2008
EXTENSIONS
Added missing term 336 and a(14)-a(47) from Donovan Johnson, Sep 27 2008
a(1)=1 prepended by Max Alekseyev, Aug 27 2013
STATUS
approved