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 A154981 Primes with nonprime smallest digit. 2
 11, 13, 17, 19, 31, 41, 47, 61, 67, 71, 89, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 241, 251, 271, 281, 307, 311, 313, 317, 331, 401, 409, 419, 421, 431, 449, 457, 461, 467, 479, 487, 491 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Nonprime digits in base 10 are 0, 1, 4, 6, 8 and 9. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE 17 is in the sequence because its smallest digit is 1, which is not prime. 19 is in the sequence because its smallest digit is 1, which is not prime (neither is 9, for that matter). 23 is not in the sequence because both of its digits are prime. MATHEMATICA Select[Prime[Range[150]], Not[PrimeQ[Min[IntegerDigits[#]]]] &] (* Alonso del Arte, Mar 28 2014, based on Harvey P. Dale's program for A155053 *) CROSSREFS Cf. A019546, A020457, A141468. Sequence in context: A267277 A155071 A003626 * A092912 A092911 A062634 Adjacent sequences:  A154978 A154979 A154980 * A154982 A154983 A154984 KEYWORD nonn,base AUTHOR Juri-Stepan Gerasimov, Jan 19 2009 EXTENSIONS Entries checked by R. J. Mathar, Mar 29 2010 STATUS approved

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Last modified May 27 21:14 EDT 2022. Contains 354110 sequences. (Running on oeis4.)