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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108323 "Binary prime squares": squares whose binary expansions, read as decimal expansions, are primes. 3
1101001001, 10111110001, 101000101001, 101011111001, 1000110001001, 1110000111001, 1110110010001, 10110010111001, 100011100110001, 111111111111001, 1000101110001001, 1101011110111001, 1111101000001001, 10101100010010001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Another definition: numbers having only digits 1 and 0 which, read in base 10, are primes, and in base 2 are squares. Derived from A108322 from which the 0-terms have been removed.

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

fd2[n_]:=FromDigits[IntegerDigits[n, 2]]; fd2/@Select[Range[300]^2, PrimeQ[fd2[#]]&](* Harvey P. Dale, Jul 10 2012 *)

CROSSREFS

Cf. A108322, A108324, A108325.

Sequence in context: A217610 A219319 A108322 * A154474 A096553 A104924

Adjacent sequences: A108320 A108321 A108322 * A108324 A108325 A108326

KEYWORD

easy,nonn,base

AUTHOR

Alexandre Wajnberg, Jun 30 2005

EXTENSIONS

More terms from Harvey P. Dale, Jul 10 2012

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 December 4 23:46 EST 2022. Contains 358572 sequences. (Running on oeis4.)