This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A077683 Squarefree numbers beginning with 7. 11
 7, 70, 71, 73, 74, 77, 78, 79, 701, 703, 705, 706, 707, 709, 710, 713, 714, 715, 717, 718, 719, 721, 723, 727, 730, 731, 733, 734, 737, 739, 741, 742, 743, 745, 746, 749, 751, 753, 754, 755, 757, 758, 759, 761, 762, 763, 766, 767, 769, 770, 771, 773, 777, 778 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Lower density is 3/(35*Pi^2), upper density is 5/(6*Pi^2). - Charles R Greathouse IV, Nov 05 2017 LINKS PROG (PARI) is(n)=n>6 && digits(n)[1]==7 && issquarefree(n) \\ Charles R Greathouse IV, Nov 05 2017 CROSSREFS Cf. A077677, A077678, A077679, A077680, A077681, A077682, A077684, A077685. Sequence in context: A302353 A059321 A217400 * A082797 A216994 A121027 Adjacent sequences:  A077680 A077681 A077682 * A077684 A077685 A077686 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy, Nov 16 2002 EXTENSIONS More terms from Sascha Kurz, Jan 28 2003 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 21 13:57 EDT 2019. Contains 328299 sequences. (Running on oeis4.)