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A131507 2n+1 appears n+1 times. 4
1, 3, 3, 5, 5, 5, 7, 7, 7, 7, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 13, 13, 15, 15, 15, 15, 15, 15, 15, 15, 17, 17, 17, 17, 17, 17, 17, 17, 17, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 23, 23, 23, 23, 23 (list; table; graph; refs; listen; history; internal format)
OFFSET

0,2

PROG

(Haskell)

a131507 n = a131507_list !! n

a131507_list = concat $ zipWith ($) (map replicate [1..]) [1, 3..]

-- Reinhard Zumkeller, Mar 18 2011

CROSSREFS

Cf. A002024, A003056.

Sequence in context: A035158 A196172 A123313 * A203998 A075260 A054847

Adjacent sequences:  A131504 A131505 A131506 * A131508 A131509 A131510

KEYWORD

nonn,tabl

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Aug 13 2007

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Last modified February 16 15:54 EST 2012. Contains 205932 sequences.