login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A101472 Numbers n such that the number n33 is prime. 4
2, 4, 7, 10, 14, 17, 19, 23, 26, 28, 34, 35, 37, 38, 41, 47, 49, 52, 53, 61, 67, 68, 73, 74, 79, 82, 89, 91, 94, 95, 97, 98, 101, 103, 104, 107, 116, 118, 119, 124, 130, 136, 139, 140, 145, 146, 152, 157, 160, 163, 164, 166, 170, 173, 181, 182, 184, 193, 194, 202 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Chris Caldwell The first 1,000 primes.

EXAMPLE

If n=2,  then n33 =  233 (prime);

If n=34, then n33 = 3433 (prime);

If n=74, then n33 = 7433 (prime).

MATHEMATICA

fQ[n_] := PrimeQ[FromDigits[ Join[ IntegerDigits[n], {3, 3}]]]; Select[ Range[203], fQ[ # ] &] (* Robert G. Wilson v, Feb 04 2005 *)

Select[Range[250], PrimeQ[FromDigits[Flatten[{IntegerDigits[#], IntegerDigits[33]}]]] &] (* Vincenzo Librandi, Jul 31 2015 *)

Select[Range[210], PrimeQ[100#+33]&] (* Harvey P. Dale, Jul 04 2017 *)

PROG

(MAGMA) [n: n in [0..250] | IsPrime(Seqint(Intseq(33) cat Intseq(n)))]; // Vincenzo Librandi, Jul 31 2015

(PARI) is(n)=isprime(100*n+33) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Cf. A090263, A109369.

Sequence in context: A170894 A151986 A287522 * A273872 A087160 A336411

Adjacent sequences:  A101469 A101470 A101471 * A101473 A101474 A101475

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Jan 30 2005

EXTENSIONS

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 14 16:56 EDT 2021. Contains 345037 sequences. (Running on oeis4.)