login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A332702 Lexicographically earliest sequence of distinct positive terms such that the leftmost digit of a(n) and the leftmost digit of a(n) + a(n+1) are the same. 1
1, 9, 81, 2, 18, 82, 3, 27, 173, 4, 36, 264, 5, 45, 355, 6, 54, 446, 7, 63, 537, 8, 72, 628, 10, 90, 810, 11, 89, 711, 12, 88, 712, 13, 87, 713, 14, 86, 714, 15, 85, 715, 16, 84, 716, 17, 83, 717, 19, 91, 809, 20, 180, 820, 21, 179, 821, 22, 178, 822, 23, 177, 823, 24, 176, 824, 25, 175, 825, 26 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Carole Dubois, Table of n, a(n) for n = 1..1000

EXAMPLE

a(1) + a(2) = 1 + 9 = 10 with 1 the leftmost digit of both 1 and 10;

a(2) + a(3) = 9 + 81 = 90 with 9 the leftmost digit of both 9 and 90;

a(3) + a(4) = 81 + 2 = 83 with 8 the leftmost digit of  both 81 and 83;

a(4) + a(5) = 2 + 18 = 20 with 2 the leftmost digit of both 2 and 20;

a(5) + a(6) = 18 + 82 = 100 with 1 the leftmost digit of both 18 and 100; etc.

CROSSREFS

Sequence in context: A055070 A143848 A317052 * A117817 A328760 A228591

Adjacent sequences:  A332699 A332700 A332701 * A332703 A332705 A332706

KEYWORD

base,nonn

AUTHOR

Eric Angelini and Carole Dubois, Feb 20 2020

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 15 00:36 EDT 2020. Contains 335762 sequences. (Running on oeis4.)