A155786 Primes whose first and last digits differ by 1.

23, 43, 67, 89, 211, 223, 233, 241, 251, 263, 271, 281, 283, 293, 433, 443, 463, 607, 617, 647, 677, 809, 827, 829, 839, 857, 859, 877, 887, 2003, 2011, 2053, 2063, 2081, 2083, 2111, 2113, 2131, 2141, 2143, 2153, 2161, 2203, 2213, 2221, 2243, 2251, 2273

Offset

1,1

Links

Table of n, a(n) for n=1..48.

Example

211 is a prime and its first and last digits differ by |2 - 1| = 1, so 211 is a term.
103 is a prime but its first and last digits differ by |1 - 3| = 2, so 103 is not a term.

Prog

(PARI) is(n)=abs(digits(n)[1]-n%10)==1 && isprime(n) \\ Charles R Greathouse IV, Dec 29 2012

Crossrefs

Cf. A000040.

Sequence in context: A156979 A281226 A158283 * A296563 A023264 A180534

Adjacent sequences: A155783 A155784 A155785 * A155787 A155788 A155789

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jan 27 2009

Extensions

827, 857, 877 etc. inserted by R. J. Mathar, Feb 13 2009

Status

approved