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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

Original entry on oeis.org

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

Views

Author

Lekraj Beedassy, Dec 29 2008

Keywords

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

Crossrefs

A034844

Programs

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

Extensions

Corrected by Harvey P. Dale, Aug 24 2017
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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