A154872 Numbers n such that smallest decimal digit of prime(n) is 1 and the largest digit of n is in {2, 3, 5, 7}.

5, 7, 13, 20, 30, 31, 32, 33, 35, 37, 45, 47, 53, 54, 67, 105, 112, 113, 115, 121, 125, 133, 135, 152, 157, 167, 200, 201, 202, 203, 205, 207, 210, 211, 215, 217, 220, 221, 222, 225, 227, 230, 231, 232, 233, 235, 237, 245, 247, 250, 251, 255, 257, 270, 271, 272

Offset

1,1

Comments

Numbers n such that smallest digit of prime(n) = odd nonprime and largest digit of n = prime.

Links

Table of n, a(n) for n=1..56.

Mathematica

Select[Range[300], MemberQ[{2, 3, 5, 7}, Max[IntegerDigits[#]]]&&Min[ IntegerDigits[ Prime[ #]]] ==1&] (* Harvey P. Dale, Jul 12 2020 *)

Crossrefs

Cf. A000027, A000040, A141468.

Sequence in context: A078884 A314328 A314329 * A314330 A349576 A022319

Adjacent sequences: A154869 A154870 A154871 * A154873 A154874 A154875

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jan 16 2009

Extensions

Entries checked by R. J. Mathar, May 05 2010

Status

approved