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A082206 Digit sum of A082205(n). 2
1, 4, 7, 10, 11, 14, 17, 18, 21, 24, 25, 28, 31, 32, 35, 38, 39, 42, 45, 46, 49, 52, 53, 56, 59, 60, 63, 66, 67, 70, 73, 74, 77, 80, 81, 84, 87, 88, 91, 94, 95, 98, 101, 102, 105, 108, 109, 112, 115, 116, 119, 122, 123, 126, 129, 130, 133, 136, 137, 140, 143, 144 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..61.

Index entries for linear recurrences with constant coefficients, signature (1, 0, 1, -1).

FORMULA

For n>0, a(n+3) = a(n) + 7.

EXAMPLE

The first six palindromes are 1, 22, 232, 3223,22322, 232232.

MATHEMATICA

CoefficientList[Series[(1+3x+3x^2+2x^3-2x^4)/((-1+x)^2(1+x+x^2)), {x, 0, 160}], x] (* Vladimir Joseph Stephan Orlovsky, Jan 26 2012 *)

Join[{1}, LinearRecurrence[{1, 0, 1, -1}, {4, 7, 10, 11}, 61]] (* Ray Chandler, Aug 25 2015 *)

CROSSREFS

Cf. A082204, A082205.

Cf. A047342. [From R. J. Mathar, Sep 17 2008]

Sequence in context: A072125 A223024 A275340 * A115566 A190507 A087298

Adjacent sequences:  A082203 A082204 A082205 * A082207 A082208 A082209

KEYWORD

base,easy,nonn,less

AUTHOR

Amarnath Murthy, Apr 10 2003

EXTENSIONS

Edited by Don Reble, Mar 13 2006

STATUS

approved

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Last modified October 1 19:48 EDT 2022. Contains 357172 sequences. (Running on oeis4.)