The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A166503 Numbers k with property that k^2 is the concatenation of two or more prime numbers. 3
5, 15, 17, 19, 23, 27, 49, 51, 53, 69, 73, 77, 85, 87, 107, 109, 115, 123, 141, 147, 151, 153, 157, 159, 163, 165, 171, 173, 177, 181, 187, 191, 199, 219, 229, 231, 233, 235, 239, 241, 243, 267, 269, 277, 279, 281, 289, 299, 319, 327, 331, 335, 337, 343, 357 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Only odd numbers are eligible.
LINKS
FORMULA
a(n) = sqrt(A038692(n)).
PROG
(PARI) for(n=1, 9999, is_A152242(n^2) & print1(n, ", ")) \\ M. F. Hasler, Oct 15 2009
CROSSREFS
Sequence in context: A109161 A065908 A297124 * A231720 A134453 A370919
KEYWORD
nonn,base
AUTHOR
Zak Seidov, Oct 15 2009
EXTENSIONS
Terms updated according to stricter definition of A152242 by M. F. Hasler, Oct 15 2009
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 June 12 17:51 EDT 2024. Contains 373359 sequences. (Running on oeis4.)