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 1-2 of 2 results.

A185441 Records in A185439; record gaps between consecutive emirps.

Original entry on oeis.org

4, 14, 34, 36, 112, 312, 1032, 3098, 10038, 30012, 100112, 300086, 1000158, 3000162, 10000056, 30000044, 100000422
Offset: 1

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Author

Jonathan Vos Post, Feb 03 2011

Keywords

Comments

This is to A005250 (increasing gaps between primes) as A006567 (emirps) are to A000040 (primes). Lower number of record emirp difference pair (emirp analog of A002386): 13, 17, 37, 113, 389, 1979, 3929.

Examples

			a(8) = 148th emirp - 147th emirp =  7027 - 3929 = 3098, given that R(7027) = 7207 is prime and R(3929) = 9293 is prime.
		

Crossrefs

Extensions

a(13) - a(17) from Nathaniel Johnston, Apr 26 2011

A333648 Bemirp gaps: differences between consecutive bemirps.

Original entry on oeis.org

30, 510, 300, 8160, 30, 5910, 3000, 87860, 3030, 58710, 30300, 907980, 3000, 496200, 199980, 3030, 76920, 3000, 20070, 8897800, 3000, 251930, 30000, 517870, 89010, 117320, 3000, 87970, 61980, 4092720, 36980, 68020, 522380, 191620, 106230, 1621950, 7200, 620
Offset: 1

Views

Author

Metin Sariyar, Mar 31 2020

Keywords

Comments

The smallest gap is 10 = 16611666611 - 16611666601 and all terms are divisible by 10 as a result of the rule that all bemirps have to end with 1. Bemirp pairs with a gap 10 are 16611666601, 16611666611, 19911999901, 19911999911, ... .

Examples

			a(1) = 1091 - 1061 = 30.
		

Crossrefs

Programs

  • Mathematica
    A048895 = Cases[Import["https://oeis.org/A048895/b048895.txt", "Table"], {, }][[All, 2]];a[n_] :=  A048895[[n+1]]-A048895[[n]];a /@ Range[1,100] (* based on A048895 b-file *)

Formula

a(n) = A048895(n+1) - A048895(n).
Showing 1-2 of 2 results.