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A193431 Put the natural numbers together without spaces and read them three at a time advancing one space each time. 5
123, 234, 345, 456, 567, 678, 789, 891, 910, 101, 11, 111, 112, 121, 213, 131, 314, 141, 415, 151, 516, 161, 617, 171, 718, 181, 819, 192, 920, 202, 21, 212, 122, 222, 223, 232, 324, 242, 425, 252, 526, 262, 627, 272, 728, 282, 829, 293, 930, 303, 31, 313 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

FORMULA

a(n) = 10 * (10 * A007376(n) + A007376(n+1)) + A007376(n+2).

PROG

(Haskell)

a193431 n = a193431_list !! (n-1)

a193431_list = f a007376_list where

   f (x:xs'@(x':x'':xs)) = 10*(10*x + x') + x'' : f xs'

CROSSREFS

Cf. A136414, A193492, A193493.

Sequence in context: A179127 A153254 A227522 * A306643 A303241 A004945

Adjacent sequences:  A193428 A193429 A193430 * A193432 A193433 A193434

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Jul 28 2011

STATUS

approved

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Last modified June 17 17:12 EDT 2019. Contains 324196 sequences. (Running on oeis4.)