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!)
A030146 Squares-of-primes in which no two adjacent digits have the same parity. 2
4, 9, 25, 49, 121, 169, 361, 529, 961, 12769, 16129, 18769, 32761, 72361, 76729, 78961, 96721, 212521, 214369, 436921, 452929, 458329, 1038361, 1630729, 1852321, 3892729, 5230369, 5470921, 5650129, 5812921, 5870929, 7230721 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Intersection of A030141 and A001248. - Michel Marcus, Feb 06 2015
LINKS
FORMULA
a(n) = A030145(n)^2. - Giovanni Resta, Aug 16 2018
MATHEMATICA
Join[{4, 9}, Select[Prime[Range[4000]]^2, Union[Sort/@OddQ/@Partition[IntegerDigits[#], 2, 1]]=={{False, True}}&]] (* Harvey P. Dale, Feb 22 2011 *)
CROSSREFS
Sequence in context: A359757 A052043 A188836 * A229970 A038771 A158146
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Definition clarified by Harvey P. Dale, Feb 23 2011
Offset changed by Michel Marcus, Feb 06 2015
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 March 29 03:51 EDT 2024. Contains 371264 sequences. (Running on oeis4.)