

A155053


Primes n with nonprime smallest digit of prime(n).


2



5, 7, 11, 13, 19, 29, 31, 37, 41, 43, 47, 53, 67, 79, 83, 89, 97, 101, 113, 127, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 347, 349, 353, 359, 379, 397, 409, 421, 431, 433, 439, 443, 449, 467, 479, 491, 523, 541, 557, 563, 569, 571, 577, 601, 613, 617, 619, 641, 643, 647, 653, 673, 677, 683, 691, 701, 709, 719, 727, 743, 751, 757, 761, 769
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OFFSET

1,1


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000


EXAMPLE

a(1) = 5 corresponds to the fact that the fifth prime is 11, the smallest digit of which is 1, which is nonprime.
a(2) = 7: the seventh prime is 17, the smallest digit of which is 1, which is nonprime.
a(3) = 11: the eleventh prime is 31, the smallest digit of which is 1, which is, again, nonprime.


MATHEMATICA

Select[Prime[Range[150]], !PrimeQ[Min[IntegerDigits[Prime[#]]]] &] (* Harvey P. Dale, Nov 25 2010 *)


CROSSREFS

Cf. A154981.
Sequence in context: A180950 A112397 A081759 * A152468 A267945 A088664
Adjacent sequences: A155050 A155051 A155052 * A155054 A155055 A155056


KEYWORD

nonn,base,less


AUTHOR

JuriStepan Gerasimov, Jan 19 2009


EXTENSIONS

Corrected (19 inserted, 1673 replaced by 167) by R. J. Mathar, May 05 2010
More terms from Harvey P. Dale, Nov 25 2010


STATUS

approved



