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 1-3 of 3 results.

A221707 Numbers n such that A216377(n) = 1.

Original entry on oeis.org

2, 4, 8, 12, 16, 20, 25, 29, 34, 39, 44, 49, 55, 60, 65, 71, 82, 88, 94, 105, 111, 117, 123, 136, 142, 148, 154, 167, 173, 180, 186, 193, 199, 206, 212, 219, 225, 232, 239, 252, 259, 266, 279, 286, 293, 300, 307, 314, 321, 328, 335, 342, 349, 356, 363, 370
Offset: 1

Views

Author

N. J. A. Sloane, Jan 25 2013

Keywords

Links

Crossrefs

Cf. A216377, A221708.

Programs

  • Mathematica
    Select[Range[2,400],IntegerDigits[#!,#][[1]]==1&] (* Harvey P. Dale, Aug 14 2020 *)

Extensions

More terms from Alois P. Heinz, Jan 28 2013

A221708 Records in A216377.

Original entry on oeis.org

2, 3, 5, 9, 13, 17, 21, 30, 40, 45, 50, 66, 77, 100, 118, 124, 130, 155, 161, 226, 246, 273, 371, 378, 385, 421, 450, 472, 509, 584, 599, 637, 660, 683, 745, 784, 855, 983, 991, 999, 1072, 1121, 1162, 1228, 1378, 1420, 1479, 1598, 1615, 1761
Offset: 1

Views

Author

N. J. A. Sloane, Jan 25 2013

Keywords

Links

Crossrefs

Cf. A216377, A221707.

Programs

  • Mathematica
    r=0; n=f=2; Table[While[(k = Floor[f/n^Floor@Log[n,f]]) <= r, f *= ++n]; r = k; n, {50}] (* Giovanni Resta, Jan 28 2013 *)

Extensions

a(41)-a(50) from Giovanni Resta, Jan 28 2013

A090105 Decimal value of largest digit of n! when it was written in base n.

Original entry on oeis.org

1, 1, 2, 2, 4, 3, 6, 6, 7, 8, 10, 5, 12, 6, 12, 8, 16, 14, 18, 19, 20, 20, 22, 23, 23, 24, 25, 24, 28, 29, 30, 29, 31, 30, 32, 33, 36, 37, 33, 39, 40, 40, 42, 40, 43, 45, 46, 45, 46, 47, 49, 51, 52, 51, 54, 55, 56, 56, 58, 59, 60, 60, 61, 63, 62, 64, 66, 67, 68, 65, 70, 67, 72, 71
Offset: 1

Views

Author

Labos Elemer, Dec 17 2003

Keywords

Examples

			For n=12: 12! = 114500000_12, so a(12) = 5.

Links

Crossrefs

Cf. A006993, A090104, A216377.

Programs

  • Maple
    f:= n -> max(convert(n!,base,n)): f(1):= 1:map(f, [$1..100]); # Robert Israel, Dec 09 2020
  • Mathematica
    Table[Max[IntegerDigits[w!, w]], {w, 2, 100}]
  • PARI
    a(n) = if(n==1, 1, vecmax(digits(n!, n))) \\ Felix Fröhlich, Dec 09 2020
Showing 1-3 of 3 results.

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

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