|
Search: id:A083092
|
|
|
| A083092 |
|
Numbers n such that 7*5^n + 2 is a prime. |
|
+0
1
|
| |
|
|
OFFSET
|
1,2
|
|
|
COMMENT
|
Values corresponding to 29, 203, 297, 617, and 1211 (848 digits) have been certified prime with Primo. Values for 2969 (2077 digits) and 3037 (2124 digits) are probable primes. There are no other terms <= 4000.
|
|
EXAMPLE
|
37, 877, 1303851604461669921877 are 7*5^1 + 2, 7*5^3 + 2, and 7*5^29 + 2,
respectively. 7*5^203 + 2 has 143 digits.
|
|
PROGRAM
|
(PARI) for(n=1, 4000, if(isprime(7*5^n+2), print1(n, ", ")))
|
|
CROSSREFS
|
Sequence in context: A112498 A118584 A126185 this_sequence A135163 A074366 A037791
Adjacent sequences: A083089 A083090 A083091 this_sequence A083093 A083094 A083095
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Rick L. Shepherd (rshepherd2(AT)hotmail.com), Apr 23 2003
|
|
|
Search completed in 0.002 seconds
|
