A330968 Prime numbers p such that 2*p - last digit of p is prime.

2, 3, 5, 7, 13, 19, 23, 31, 37, 43, 53, 59, 67, 79, 83, 113, 139, 157, 179, 193, 199, 211, 223, 229, 233, 263, 271, 277, 283, 307, 331, 359, 367, 373, 389, 397, 409, 419, 433, 443, 457, 487, 509, 547, 563, 569, 601, 613, 619, 643, 653, 661, 691, 709, 719, 727

Offset: 1

Author

Dimitris Valianatos, Feb 06 2020

Keywords

• nonn
• base

Comments

Prime numbers p such that 2*p - (p mod 10) is prime.

Examples

			Prime number 19 is a term since 2 * 19 - (19 mod 10) = 2 * 19 - 9 = 29, a prime.
		

Crossrefs

Cf. A000040, A007652.

Programs

Magma

[p:p in PrimesUpTo(750)| IsPrime(2*p-(p mod 10))]; // Marius A. Burtea, Feb 07 2020

PARI

forprime(p = 2, 1000, if(isprime(2*p - p%10), print1(p", ")))