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A157175
Primes such that sum of first digit and smallest digit is a prime.
2
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
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
KEYWORD
nonn,base,less
AUTHOR
EXTENSIONS
197 and 241 inserted by R. J. Mathar, Feb 26 2009
STATUS
approved