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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A154891 Where records occurs in A154804.

Original entry on oeis.org

1, 2, 4, 9, 12, 21, 24, 30, 42, 45, 57, 60, 75, 84, 90, 105, 135, 150, 165, 195, 210, 255, 315, 330, 390, 420, 525, 630, 735, 825, 840, 945, 1050, 1155, 1365, 1575, 1680, 1785, 1995, 2100, 2145, 2205, 2310, 2625, 2730, 3045, 3255, 3465, 3990, 4095, 4515, 4620
Offset: 1

Views

Author

Omar E. Pol, Feb 01 2009

Keywords

Links

Crossrefs

Cf. A008578, A154804, A154720, A154721, A154799.

Programs

  • Maple
    A008578 := proc(n) RETURN( n=1 or isprime(n) ) ; end : A154804 := proc(n) local a,d; a := 0 ; for d from 1 to n-1 do if A008578(n-d) and A008578(n+d) then a := a+1; fi; od: a ; end: a804 := [seq(A154804(n),n=1..4000)] ; r := RECORDS(a804)[2] ; # R. J. Mathar, Mar 14 2009

Extensions

More terms from R. J. Mathar, Mar 14 2009
a(50) and beyond from Michael S. Branicky, Dec 11 2024
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