A268859 Prime numbers ending in 21.

421, 521, 821, 1021, 1321, 1621, 1721, 2221, 2521, 2621, 3121, 3221, 3821, 4021, 4421, 4621, 4721, 5021, 5521, 5821, 6121, 6221, 6421, 6521, 7121, 7321, 7621, 8221, 8521, 8821, 9221, 9421, 9521, 9721, 10321, 11321, 11621, 11821, 12421, 12721, 12821, 13121

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Maple

A268859:=n->`if`(isprime(n) and n mod 100 = 21, n, NULL): seq(A268859(n), n=1..5*10^4); # Wesley Ivan Hurt, Apr 02 2016

Mathematica

Select[Table[21 + 100 i, {i, 0, 10^3}], ProvablePrimeQ[#] &]

Prog

(Magma) [n: n in PrimesUpTo(15000) | n mod 100 eq 21]; // Vincenzo Librandi, Feb 15 2016
(PARI) lista(nn) = {for(n=1, nn, if (isprime(p=100*n+21), print1(p, ", ")); ); } \\ Michel Marcus, Feb 20 2016
(Python)
from sympy import isprime
for n in range(421, 15000, 100):
    if(isprime(n)):print(n)
# Soumil Mandal, Apr 03 2016

Crossrefs

Cf. A268858, A268860.

Sequence in context: A014890 A159589 A031784 * A051648 A375407 A217497

Adjacent sequences: A268856 A268857 A268858 * A268860 A268861 A268862

Keyword

nonn,base

Author

Soumadeep Ghosh, Feb 14 2016

Status

approved