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A132230 Primes congruent to 1 (mod 30). 20
31, 61, 151, 181, 211, 241, 271, 331, 421, 541, 571, 601, 631, 661, 691, 751, 811, 991, 1021, 1051, 1171, 1201, 1231, 1291, 1321, 1381, 1471, 1531, 1621, 1741, 1801, 1831, 1861, 1951, 2011, 2131, 2161, 2221, 2251, 2281, 2311, 2341, 2371, 2521, 2551, 2671 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also primes congruent to 1 (mod 15). - N. J. A. Sloane, Jul 11 2008

Primes ending in 1 with (SOD-1)/3 integer where SOD is sum of digits. - Ki Punches, Feb 04 2009

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..10000

C. K. Caldwell, The Prime Pages.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

FORMULA

a(n) = A111175(n)*30 + 1. - Ray Chandler, Apr 07 2009

Intersection of A030430 and A002476. - Ray Chandler, Apr 07 2009

EXAMPLE

From Muniru A Asiru, Nov 01 2017: (Start)

31 is a prime and 31 = 30*1 + 1;

61 is a prime and 61 = 30*2 + 1;

151 is a prime and 151 = 30*5 + 1;

211 is a prime and 211 = 30*7 + 1;

241 is a prime and 241 = 30*8 + 1;

271 is a prime and 271 = 30*9 + 1.

(End)

MAPLE

select(isprime, [seq(i, i=1..1000, 30)]); # Robert Israel, Jan 19 2016

MATHEMATICA

Select[Range[1, 3000, 30], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Feb 19 2012 *)

PROG

(PARI) is(n)=isprime(n) && n%30==1 \\ Charles R Greathouse IV, Jul 01 2016

(GAP) A132230 := Filtered(Filtered([1..10^6], n -> n mod 30 = 1), IsPrime); # Muniru A Asiru, Nov 01 2017

CROSSREFS

Cf. A057204, A068228, A129805, A039949, A132231-A132236.

Sequence in context: A054804 A128470 A195744 * A136066 A282326 A114991

Adjacent sequences:  A132227 A132228 A132229 * A132231 A132232 A132233

KEYWORD

nonn,easy

AUTHOR

Omar E. Pol, Aug 15 2007

EXTENSIONS

Edited by Ray Chandler, Apr 07 2009

STATUS

approved

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Last modified September 19 11:06 EDT 2019. Contains 327192 sequences. (Running on oeis4.)