cp's OEIS Frontend

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.

Showing 1-1 of 1 results.

A085414 Primes that are a concatenation of a prime and its first digit.

Original entry on oeis.org

131, 191, 313, 373, 797, 1031, 1091, 1511, 1571, 1811, 1931, 3313, 3373, 3533, 3593, 3673, 3733, 3793, 3833, 7517, 7577, 7877, 9199, 9419, 9479, 9539, 9679, 9719, 9839, 10091, 10211, 10331, 10391, 10631, 10691, 11171, 12011, 12491, 12791, 12911
Offset: 1

Views

Author

Zak Seidov, Jun 29 2003

Keywords

Comments

Also primes remaining prime after deleting last digit, but not all such primes. See also A012833, A024770, A033664, A069867.

Examples

			13 is a term because concatenation of 13 and 1 is prime.

Crossrefs

Cf. A085412, A085413, A012833, A024770, A033664, A069867.
Showing 1-1 of 1 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.