A062334 Primes starting and ending with 7.

7, 727, 757, 787, 797, 7027, 7057, 7127, 7177, 7187, 7207, 7237, 7247, 7297, 7307, 7417, 7457, 7477, 7487, 7507, 7517, 7537, 7547, 7577, 7607, 7687, 7717, 7727, 7757, 7817, 7867, 7877, 7907, 7927, 7937, 70067, 70117, 70157, 70177, 70207, 70237

Offset: 1

Author

Amarnath Murthy, Jun 21 2001

Keywords

• nonn
• base
• easy

Examples

			7687 is a member, as it is a prime and the first and the last digits are both 7.
		

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A062332, A062333, A062335.

Programs

PARI

{ default(primelimit, 800000); n=-1; t=log(10); forprime (p=2, 800000, if ((p-10*(p\10)) == 7 && (p\10^(log(p)\t)) == 7, write("b062334.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Aug 05 2009

Extensions

More terms from Larry Reeves (larryr(AT)acm.org), Jun 29 2001

Offset changed by Andrew Howroyd, Sep 17 2024