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A224866 Numbers of the form m*rad(m)+1, where rad=A007947 (squarefree kernel). 5
2, 5, 9, 10, 17, 26, 28, 33, 37, 50, 65, 73, 82, 101, 109, 122, 126, 129, 145, 170, 197, 201, 217, 226, 244, 257, 289, 290, 325, 344, 362, 393, 401, 433, 442, 485, 501, 513, 530, 577, 626, 649, 676, 677, 730, 785, 801, 842, 865, 901, 962, 969, 973, 1001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A078310 in natural order.

LINKS

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

FORMULA

a(n) = A001694(n) + 1.

PROG

(Haskell)

a224866 n = a224866_list !! (n-1)

a224866_list = [x | x <- [2..] , let x' = x - 1, let k = a007947 x',

                    let (y, m) = divMod x' k, m == 0, a007947 y == k]

(PARI) is(n)=ispowerful(n+1) \\ Charles R Greathouse IV, Aug 08 2013

CROSSREFS

Subsequences: A078325, A078324.

Sequence in context: A191776 A095347 A249353 * A159073 A088343 A110781

Adjacent sequences:  A224863 A224864 A224865 * A224867 A224868 A224869

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 23 2013

STATUS

approved

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Last modified January 18 20:19 EST 2018. Contains 297865 sequences.