This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A045524 n! has initial digit '5'. 18
 7, 21, 38, 46, 61, 66, 81, 119, 137, 144, 150, 165, 189, 196, 206, 209, 221, 224, 235, 243, 248, 253, 258, 279, 292, 340, 342, 353, 362, 383, 413, 429, 440, 488, 508, 529, 540, 584, 597, 611, 630, 651, 662, 679, 685, 704, 711, 718, 725, 732, 764, 782, 812 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES n such that A000030(A000142(n))=5. Robert Israel, Feb 07 2017 LINKS Chai Wah Wu, Table of n, a(n) for n = 1..10000 MAPLE filter:= proc(t) local tf; tf:= t!; floor(tf/10^ilog10(tf)) = 5 end proc: select(filter, [\$1..1000]); # Robert Israel, Feb 07 2017 MATHEMATICA Select[ Range[ 850 ], IntegerDigits[ #! ] [[1]] == 5 & ] PROG (PARI) isok(n) = digits(n!)[1] == 5; \\ Michel Marcus, Feb 08 2017 CROSSREFS For factorials with initial digit d (1 <= d <= 9) see A045509, A045510, A045511, A045516, A045517, A045518, A282021, A045519; A045520, A045521, A045522, A045523, A045525, A045526, A045527, A045528, A045529. Cf. A000030, A000142. Sequence in context: A208543 A009475 A063292 * A125228 A024837 A205864 Adjacent sequences:  A045521 A045522 A045523 * A045525 A045526 A045527 KEYWORD nonn,base AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 16 13:11 EDT 2019. Contains 328073 sequences. (Running on oeis4.)