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A155070

Primes with nonprime largest digit.

11, 19, 29, 41, 43, 59, 61, 79, 83, 89, 97, 101, 109, 139, 149, 163, 179, 181, 191, 193, 197, 199, 229, 239, 241, 263, 269, 281, 283, 293, 349, 359, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 461, 463, 479, 487, 491, 499, 509, 563, 569

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Nonprime digit = 0, 1, 4, 6, 8 and 9.

Zero cannot be the largest digit of any prime number. - Harvey P. Dale, Jul 14 2014

LINKS

Table of n, a(n) for n=1..54.

EXAMPLE

11(1=1=nonprime), 19(1<9=nonprime), 29(2<9=nonprime), 41(nonprime=4>1), etc.

MATHEMATICA

Select[Prime[Range[200]], !PrimeQ[Max[IntegerDigits[#]]]&] (* Harvey P. Dale, Jul 14 2014 *)