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A013898 21^(5n+1). 1
21, 85766121, 350277500542221, 1430568690241985328321, 5842587018385982521381124421, 23861715484377209601555171628930521, 97453656071460446110921078004886769746621, 398010574215107679422058885600836061208944572721, 1625515384162495488635310116741260158419511738394408821 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) mod 10 == 1 (the least significant decimal digit of each term is 1).

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..50

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (4084101).

FORMULA

a(n) = 4084101*a(n-1), a(0)=21. [Vincenzo Librandi, May 27 2011]

MATHEMATICA

NestList[4084101#&, 21, 10] (* Harvey P. Dale, Apr 17 2013 *)

PROG

(MAGMA) [21^(5*n+1): n in [0..10]]; // Vincenzo Librandi, May 27 2011

CROSSREFS

Sequence in context: A033636 A138080 A013814 * A180727 A250487 A062012

Adjacent sequences:  A013895 A013896 A013897 * A013899 A013900 A013901

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified August 21 09:54 EDT 2017. Contains 290864 sequences.