|
|
A176090
|
|
Numbers n such that 2(10^n-1)/3 * 10^ceiling(log_10(n+1)) + n is prime.
|
|
3
|
|
|
|
OFFSET
|
1,2
|
|
COMMENTS
|
No term is a multiple of 2, 3, or 5. The decimal expansion of each corresponding prime (in A176272) is n 6's with n's decimal expansion concatenated. Primes and probable primes found by PrimeForm. Prime for 41 proved by Primo. No more terms up to 30000.
|
|
LINKS
|
|
|
EXAMPLE
|
The numbers 1 and 7 are terms because 61 and 66666667 are prime.
|
|
PROG
|
|
|
CROSSREFS
|
|
|
KEYWORD
|
more,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|