|
|
A146981
|
|
Numbers k of the form q^2, q = prime, such that k-2 is a prime.
|
|
2
|
|
|
4, 9, 25, 49, 169, 361, 841, 1369, 1849, 2209, 3721, 5041, 7921, 10609, 11449, 16129, 17161, 19321, 29929, 36481, 44521, 49729, 54289, 57121, 66049, 85849, 97969, 113569, 128881, 177241, 196249, 201601, 218089, 241081, 273529, 292681, 323761
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
Except for initial term, a(n) - 1 is not a squarefree number.
|
|
LINKS
|
|
|
FORMULA
|
|
|
MATHEMATICA
|
Select[Prime[Range[150]]^2, PrimeQ[#-2]&] (* Harvey P. Dale, Jan 15 2020 *)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
Corrected (3721 inserted, 10321 replaced by 19321, 49729 and 218089 inserted) by R. J. Mathar, Apr 22 2010
|
|
STATUS
|
approved
|
|
|
|