A102611 Numbers n such that the number n77 is prime.

2, 5, 6, 8, 9, 12, 17, 18, 23, 24, 26, 27, 36, 38, 41, 48, 50, 54, 62, 65, 69, 71, 74, 75, 78, 83, 86, 92, 93, 96, 101, 104, 111, 116, 117, 122, 123, 125, 131, 134, 135, 138, 141, 150, 152, 153, 158, 164, 170, 173, 174, 179, 180, 194, 195, 197, 201, 204, 212, 213, 215

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Chris Caldwell, The first 1,000 primes.

Example

At n=2, n77 = 277 (prime).
At n=27, n77 = 2777 (prime).
At n=78, n77 = 7877 (prime).

Mathematica

fQ[n_] := PrimeQ[ FromDigits[ Join[ IntegerDigits[n], {7, 7}]]]; Select[ Range[218], fQ[ # ] &] (* Robert G. Wilson v, Feb 04 2005 *)
Select[Range[300], PrimeQ[100#+77]&] (* Harvey P. Dale, Mar 17 2015 *)

Prog

(PARI) is(n)=isprime(100*n+77) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Sequence in context: A350945 A273867 A047325 * A323112 A176114 A057915

Adjacent sequences: A102608 A102609 A102610 * A102612 A102613 A102614

Keyword

nonn,base

Author

Parthasarathy Nambi, Jan 30 2005

Extensions

More terms from Robert G. Wilson v, Feb 04 2005

Status

approved