cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A254673 Primes prime(n) such that prime(n) + 4*n is also prime.

Original entry on oeis.org

3, 5, 7, 11, 13, 23, 47, 59, 71, 73, 79, 97, 103, 113, 127, 137, 181, 199, 251, 263, 271, 281, 293, 331, 359, 367, 397, 419, 433, 443, 449, 457, 463, 487, 503, 523, 541, 571, 607, 613, 617, 631, 653, 709, 719, 751, 761, 773, 829, 839, 877, 881, 953, 967, 971
Offset: 1

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Author

Vincenzo Librandi, Feb 05 2015

Keywords

Examples

			prime(4)=7 is in the sequence because 7+4*4 = 23 is prime.
prime(6)=13 is in the sequence because 13+4*6 = 37 is prime.
		

Crossrefs

Programs

  • Magma
    [NthPrime(n): n in [1..200] | IsPrime(NthPrime(n)+4*n)]
  • Mathematica
    Prime[Select[Range[180], PrimeQ[Prime[#] + 4 #] &]]
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