The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A045856 Numbers whose square has initial digit '2'. 2
 5, 15, 16, 17, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 448, 449, 450, 451, 452, 453, 454, 455, 456 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Seiichi Manyama, Table of n, a(n) for n = 1..10000 MATHEMATICA Select[Range[500], IntegerDigits[#^2][[1]]==2&] (* Harvey P. Dale, Apr 15 2024 *) PROG (PARI) isok(n) = digits(n^2)[1] == 2; \\ Michel Marcus, May 28 2017 CROSSREFS Cf. A045785 Sequence in context: A184288 A015666 A291627 * A102185 A030486 A101238 Adjacent sequences: A045853 A045854 A045855 * A045857 A045858 A045859 KEYWORD nonn,base,changed AUTHOR Jeff Burch EXTENSIONS Corrected by Seiichi Manyama, May 28 2017 STATUS approved

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

Last modified April 17 15:33 EDT 2024. Contains 371764 sequences. (Running on oeis4.)