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A145011 First differences of A007775. 3
6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2, 6, 4, 2, 4, 2, 4, 6, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Terms of the simple continued fraction of 3836/[sqrt(19822530)-3836]. - Paolo P. Lava, Aug 05 2009

Also the first differences of A084968 divided by 7. - Antti Karttunen, May 01 2015

LINKS

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

FORMULA

Period 8: repeat 6,4,2,4,2,4,6,2.

a(n) = (1/112)*{-41*(n mod 8)+71*[(n+1) mod 8]-13*[(n+2) mod 8]-13*[(n+3) mod 8]+43*[(n+4) mod 8]-13*[(n+5) mod 8]+43*[(n+6) mod 8]+43*[(n+7) mod 8]}, with n>=0. [Paolo P. Lava, Aug 28 2009]

a(n) = 2*((abs(abs((n mod 8) - 3) - 1) mod 3) + 1). - Pieter Stadhouders, Mar 09 2010

MATHEMATICA

Differences[Select[Range[400], GCD[#, 30]==1&]] (* Harvey P. Dale, Dec 07 2011 *)

PROG

(Haskell)

a145011 n = a145011_list !! (n-1)

a145011_list = zipWith (-) (tail a007775_list) a007775_list

-- Reinhard Zumkeller, Jan 06 2013

(PARI) a(n)=[4, 6, 4, 2, 4, 2][n%8+1] \\ Charles R Greathouse IV, Oct 20 2013

CROSSREFS

Cf. A007775, A084968.

Multiplied by 7: row 4 of A257251.

Sequence in context: A125214 A114062 A028975 * A173625 A086036 A019849

Adjacent sequences:  A145008 A145009 A145010 * A145012 A145013 A145014

KEYWORD

nonn,easy

AUTHOR

Ki Punches, Feb 25 2009

EXTENSIONS

Edited by Omar E. Pol, Mar 02 2009

Offset corrected by Reinhard Zumkeller, Jan 06 2013

STATUS

approved

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Last modified August 20 06:32 EDT 2017. Contains 290824 sequences.