|
Search: id:A143932
|
|
|
| A143932 |
|
a(n)=smallest positive prime numbers of the form x^2-n! (where x is positive integer) |
|
+0
3
|
|
| 3, 2, 3, 97, 241, 241, 1201, 3361, 5569, 61441, 240769, 915049, 240769, 17302321, 7076521, 49186201, 2100735289, 1074527281, 23971813321, 32354445841, 68820869329, 2992426816129, 26238323995129, 104071698229321
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
For smallest positive integers x see A143931. Prime x see A143933.
|
|
EXAMPLE
|
a(1)=3 because 2^2-1!=3 a(2)=2 because 2^2-2!=2 a(3)=3 because 3^2-3!=3 a(4)=97 because 11^2-4!=97
|
|
MATHEMATICA
|
b = {}; Do[k = Round[Sqrt[n! ]] + 1; While[ ! PrimeQ[k^2 - n! ], k++ ]; AppendTo[b, k^2-n! ], {n, 1, 50}]; b (*Artur Jasinski*)
|
|
CROSSREFS
|
A121926, A143931, A143933
Sequence in context: A139075 A089750 A109591 this_sequence A118064 A070471 A070690
Adjacent sequences: A143929 A143930 A143931 this_sequence A143933 A143934 A143935
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Artur Jasinski (grafix(AT)csl.pl), Sep 05 2008
|
|
|
Search completed in 0.002 seconds
|
