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A049073 LCM of all divisors of d of n such that d+1 is a prime power. 3
1, 2, 3, 4, 1, 6, 7, 8, 3, 10, 1, 12, 1, 14, 15, 16, 1, 18, 1, 20, 21, 22, 1, 24, 1, 26, 3, 28, 1, 30, 31, 16, 3, 2, 7, 36, 1, 2, 3, 40, 1, 42, 1, 44, 15, 46, 1, 48, 7, 10, 3, 52, 1, 18, 1, 56, 3, 58, 1, 60, 1, 62, 63, 16, 1, 66, 1, 4, 3, 70, 1, 72, 1, 2, 15, 4, 7, 78, 1, 80, 3, 82, 1, 84, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(A185208(n)) = 1. - Reinhard Zumkeller, Nov 01 2012

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for sequences related to lcm's

MATHEMATICA

a[n_] := LCM @@ Select[Divisors[n], PrimeNu[# + 1] == 1 &]; Table[a[n], {n, 1, 85}] (* Jean-François Alcover, Aug 17 2013 *)

PROG

(Haskell)

a049073 = foldl lcm 1 . filter ((== 1) . a010055 . (+ 1)) . a027750_row

-- Reinhard Zumkeller, Nov 01 2012

CROSSREFS

Cf. A141197, A027750, A010055.

Sequence in context: A001438 A105587 A319676 * A076388 A264977 A109680

Adjacent sequences:  A049070 A049071 A049072 * A049074 A049075 A049076

KEYWORD

nonn,easy,nice

AUTHOR

David E. Daykin

EXTENSIONS

More terms from Erich Friedman, Jun 03 2001

STATUS

approved

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Last modified November 22 10:59 EST 2019. Contains 329389 sequences. (Running on oeis4.)