login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A009299 If a, b in sequence, so is a*b+2. 4
2, 6, 14, 30, 38, 62, 78, 86, 126, 158, 174, 182, 198, 230, 254, 318, 350, 366, 374, 398, 422, 462, 470, 510, 518, 534, 638, 702, 734, 750, 758, 798, 846, 870, 902, 926, 942, 950, 1022, 1038, 1046, 1070, 1094, 1142, 1190, 1206, 1278, 1382, 1406, 1446, 1470, 1502 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

PROG

(Haskell)

import Data.Set (singleton, deleteFindMin, insert)

a009299 n = a009299_list !! (n-1)

a009299_list = f [2] (singleton 2) where

   f xs s = m : f xs' (foldl (flip insert) s' (map ((+ 2) . (* m)) xs'))

     where xs' = m : xs

           (m, s') = deleteFindMin s

-- Reinhard Zumkeller, Aug 15 2011

CROSSREFS

Cf. A009293, A192476.

Sequence in context: A123991 A112511 A063452 * A330766 A072611 A284023

Adjacent sequences:  A009296 A009297 A009298 * A009300 A009301 A009302

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 1 18:43 EDT 2020. Contains 334762 sequences. (Running on oeis4.)