A153640 Primes made up of a nonprime number of only nonprime digits.

1009, 1019, 1049, 1061, 1069, 1091, 1109, 1181, 1409, 1481, 1489, 1499, 1601, 1609, 1619, 1669, 1699, 1801, 1811, 1861, 1889, 1901, 1949, 1999, 4001, 4019, 4049, 4091, 4099, 4111, 4409, 4441, 4481, 4649, 4691, 4801, 4861, 4889, 4909, 4919, 4969, 4999, 6011

Offset

1,1

Comments

There are no one-digit terms, 106 four-digit terms, 2493 six-digit terms, 65989 eight-digit terms, and 350408 nine-digit terms. Of course, there are many more terms of greater-than-9-digit length. - Harvey P. Dale, Aug 24 2017

Links

Table of n, a(n) for n=1..43.

Mathematica

Select[FromDigits/@Tuples[{0, 1, 4, 6, 8, 9}, 4], IntegerLength[#]==4&&PrimeQ[#]&] (* Harvey P. Dale, Aug 24 2017 *)

Crossrefs

A034844

Sequence in context: A145235 A210759 A171119 * A139665 A261405 A325090

Adjacent sequences: A153637 A153638 A153639 * A153641 A153642 A153643

Keyword

nonn,base

Author

Lekraj Beedassy, Dec 29 2008

Extensions

Corrected by Harvey P. Dale, Aug 24 2017

Status

approved