A157175 Primes such that sum of first digit and smallest digit is a prime.

11, 13, 17, 19, 41, 43, 61, 83, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 241, 251, 271, 281, 307, 419, 421, 431, 433, 439, 443, 461, 463, 491, 503, 509, 523, 613, 617, 619, 631, 641, 659, 661, 691, 701, 709

Offset

1,1

Comments

The first digit and the smallest digit may be the same digit. - Harvey P. Dale, Sep 23 2021

Links

Harvey P. Dale, Table of n, a(n) for n = 1..2000

Example

11(1+1=2=prime), 13(1+1=2=prime), 17(1+1=2=prime), 19(1+1=2=prime), 41(4+1=5=prime), 43(4+3=7=prime), etc.

Mathematica

Select[Prime[Range[150]], PrimeQ[Min[IntegerDigits[#]]+IntegerDigits[#][[1]]]&] (* Harvey P. Dale, Sep 23 2021 *)

Crossrefs

Cf. A000040.

Sequence in context: A271367 A226217 A275058 * A132244 A262731 A087201

Adjacent sequences: A157172 A157173 A157174 * A157176 A157177 A157178

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Feb 24 2009

Extensions

197 and 241 inserted by R. J. Mathar, Feb 26 2009

Status

approved