login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081990 Numbers k such that both k+1 and (product of digits of k) + 1 are squares. 3

%I #8 May 06 2018 00:43:37

%S 3,8,24,35,168,528,624,783,1443,3843,5183,7568,8835,12543,13224,15128,

%T 17423,24335,26243,27224,41615,47523,75624,87615,92415,118335,128163,

%U 135423,172224,213443,225624,262143,265224,274575,338723,345743,374543

%N Numbers k such that both k+1 and (product of digits of k) + 1 are squares.

%e 168 belongs to this sequence as both 1*6*8 + 1 = 49 and 168 + 1 = 169 are squares.

%Y Cf. A081989.

%K base,easy,nonn

%O 1,1

%A _Amarnath Murthy_, Apr 04 2003

%E Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 10:51 EDT 2024. Contains 371967 sequences. (Running on oeis4.)