The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A082027 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

a(1)=6; a(n) is concatenation of the squares of each digit of a(n-1), in order (in base 10).
(history; published version)

#6 by Harvey P. Dale at Thu Feb 28 09:21:05 EST 2013

STATUS

editing

approved

#5 by Harvey P. Dale at Thu Feb 28 09:21:01 EST 2013

MATHEMATICA

NestList[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[#]^2)]]&, 6, 10] (* Harvey P. Dale, Feb 28 2013 *)

STATUS

approved

editing

#4 by Russ Cox at Fri Mar 30 17:27:18 EDT 2012

AUTHOR

_Matthew Vandermast (ghodges14(AT)comcast.net), _, Apr 01 2003

Discussion

Fri Mar 30

17:27

OEIS Server: https://oeis.org/edit/global/142

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

EXAMPLE

a(4)=81936 because the squares of the digits of a(3)--namely, 9, 3, and 6--are 81, 9, and 36 respectively.

KEYWORD

base,easy,nonn,new

#2 by N. J. A. Sloane at Sun Feb 20 03:00:00 EST 2005

KEYWORD

base,easy,nonn,new

AUTHOR

Matthew Vandermast (ghodges14(AT)msncomcast.comnet), Apr 01 2003

#1 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

NAME

a(1)=6; a(n) is concatenation of the squares of each digit of a(n-1), in order (in base 10).

DATA

6, 36, 936, 81936, 64181936, 3616164181936, 93613613616164181936, 819361936193613613616164181936, 641819361819361819361936193613613616164181936

OFFSET

1,1

COMMENTS

If m is a member of the sequence consisting of k base-10 digits, every member of the sequence greater than m is congruent to m modulo 10^k.

EXAMPLE

a(4)=81936 because the squares of the digits of a(3)--namely, 9, 3, and 6--are 81, 9, and 36 respectively.

CROSSREFS

KEYWORD

base,easy,nonn

AUTHOR

Matthew Vandermast (ghodges14(AT)msn.com), Apr 01 2003

STATUS

approved