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!)
A064905 Semiprimes p1*p2 such that p2 mod p1 = 7. 1
319, 697, 767, 803, 1219, 1529, 1577, 1781, 1853, 2119, 2497, 2981, 3133, 3223, 3509, 3587, 3649, 3707, 3743, 3809, 3949, 4061, 4393, 4747, 5161, 5249, 5321, 5401, 5837, 5899, 5909, 5983, 5989, 6127, 6509, 6611, 6631, 6931, 7633, 7697, 8063, 8203, 8473, 8797 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

MATHEMATICA

m7Q[n_]:=Module[{f=Transpose[FactorInteger[n]][[1]]}, Length[f]==2 && Mod[ f[[2]], f[[1]]]==7]; Select[Range[10000], m7Q] (* Harvey P. Dale, May 02 2016 *)

CROSSREFS

Cf. A001358 (p2 mod p1 = 0), A064899-A064911.

Sequence in context: A053020 A250660 A252410 * A293921 A121010 A110289

Adjacent sequences:  A064902 A064903 A064904 * A064906 A064907 A064908

KEYWORD

nonn

AUTHOR

Patrick De Geest, Oct 13 2001

EXTENSIONS

Corrected and extended by Harvey P. Dale, May 02 2016

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 30 00:49 EDT 2021. Contains 346346 sequences. (Running on oeis4.)