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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
OFFSET
1,1
LINKS
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
KEYWORD
nonn,base,less
AUTHOR
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