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.

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A202263 Primes in which all substrings and reversal substrings are primes.

Original entry on oeis.org

2, 3, 5, 7, 37, 73, 373
Offset: 1

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Author

Jaroslav Krizek, Dec 25 2011

Keywords

Comments

Sequence is finite with 7 terms.
Subsequence of A085823, A068669, A024770, A012883.

Examples

			All substrings and reversal substrings of 373 are primes:3, 7, 37, 73, 373.

Crossrefs

Cf. A202264 (noncomposite numbers in which all substrings and reversal substrings are noncomposite), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes), A202266 (composite numbers in which all substrings and reversal substrings are composites).

A202266 Composite numbers in which all substrings and reversal substrings are composites.

Original entry on oeis.org

4, 6, 8, 9, 44, 46, 48, 49, 64, 66, 68, 69, 84, 86, 88, 94, 96, 99, 444, 446, 448, 464, 466, 468, 469, 484, 486, 488, 494, 496, 644, 646, 648, 649, 664, 666, 668, 669, 684, 686, 688, 694, 696, 699, 844, 846, 848, 849, 864, 866, 868, 869, 884, 886, 888, 946, 948
Offset: 1

Views

Author

Jaroslav Krizek, Dec 25 2011

Keywords

Comments

Subsequence of A202265, A202262.

Examples

			All substrings and reversal substrings of 446 are composites: 4, 6, 44, 46, 64, 446, 644.

Crossrefs

Cf. A202263 (primes in which all substrings and reversal substrings are primes), A202264 (noncomposite numbers in which all substrings and reversal substrings are noncomposite), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes).
Showing 1-2 of 2 results.

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

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