|
| |
|
|
A007811
|
|
Numbers n for which 10n+1, 10n+3, 10n+7 and 10n+9 are primes.
|
|
16
| |
|
|
1, 10, 19, 82, 148, 187, 208, 325, 346, 565, 943, 1300, 1564, 1573, 1606, 1804, 1891, 1942, 2101, 2227, 2530, 3172, 3484, 4378, 5134, 5533, 6298, 6721, 6949, 7222, 7726, 7969, 8104, 8272, 8881, 9784, 9913
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
LINKS
| Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
|
|
|
FORMULA
| A007811(n)=3*A014561(n)+1. [From Zak Seidov (zakseidov(AT)yahoo.com), Sep 21 2009]
|
|
|
MAPLE
| for n from 1 to 10000 do m := 10*n: if isprime(m+1) and isprime(m+3) and isprime(m+7) and isprime(m+9) then print(n); fi: od: quit
|
|
|
MATHEMATICA
| Select[ Range[ 1, 10000, 3 ], PrimeQ[ 10*#+1 ] && PrimeQ[ 10*#+3 ] && PrimeQ[ 10*#+7 ] && PrimeQ[ 10*#+9 ]& ]
Select[Range[15000], And @@ PrimeQ /@ ({1, 3, 7, 9} + 10#) &] (*Chandler*)
|
|
|
CROSSREFS
| Cf. A024912, A102338, A102342, A102700.
Cf. A007530, A014561.
Sequence in context: A033866 A023109 A146091 * A166706 A131495 A060630
Adjacent sequences: A007808 A007809 A007810 * A007812 A007813 A007814
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com) and J. H. Conway (conway(AT)math.princeton.edu)
|
| |
|
|
