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!)
A299972 Lexicographic first sequence of positive integers such that a(n) + a(n+1) has a digit 2, and no term occurs twice. 11
1, 11, 9, 3, 17, 4, 8, 12, 10, 2, 18, 5, 7, 13, 14, 6, 15, 27, 25, 37, 35, 47, 45, 57, 55, 65, 56, 16, 26, 36, 46, 66, 54, 28, 24, 38, 34, 48, 44, 58, 62, 20, 22, 30, 32, 40, 42, 50, 52, 60, 61, 21, 31, 41, 51, 69, 23, 19, 33, 29, 43, 39, 53, 49, 63, 59, 64, 68 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A permutation of the positive integers.

LINKS

Table of n, a(n) for n=1..68.

PROG

(PARI) a(n, f=1, d=2, a=1, u=[a])={for(n=2, n, f&&if(f==1, print1(a", "), write(f, n-1, " "a)); for(k=u[1]+1, oo, setsearch(u, k)&&next; setsearch(Set(digits(a+k)), d)&&(a=k)&&break); u=setunion(u, [a]); u[2]==u[1]+1&&u=u[^1]); a}

CROSSREFS

Cf. A299970 (analog with digit 0), A299957 (digit 1), A299973..A299979 (digit 3..9).

Sequence in context: A304699 A133236 A038322 * A334275 A090075 A004500

Adjacent sequences:  A299969 A299970 A299971 * A299973 A299974 A299975

KEYWORD

nonn,base

AUTHOR

M. F. Hasler and Eric Angelini, Feb 22 2018

STATUS

approved

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 September 29 16:23 EDT 2022. Contains 357090 sequences. (Running on oeis4.)