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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A062102 Numbers n such that no substring is a triangular number. 1
 2, 4, 5, 7, 8, 9, 22, 24, 25, 27, 29, 42, 44, 47, 48, 49, 52, 54, 57, 58, 59, 72, 74, 75, 77, 79, 82, 84, 85, 87, 88, 89, 92, 94, 95, 97, 98, 99, 222, 224, 225, 227, 229, 242, 244, 247, 248, 249, 252, 254, 257, 258, 259, 272, 274, 275, 277, 279, 292, 294, 295, 297 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE 23 is not included because 3 is triangular MAPLE istri:= n -> issqr(1+8*n): filter:= proc(n) local d, i, j, v; for i from 0 do v:= floor(n/10^i); if v = 0 then return true fi; if istri(v) then return false fi; for j from ilog10(v) to 1 by -1 do if istri(v mod 10^j) then return false fi; od od end proc: select(filter, [\$1..1000]); # Robert Israel, Aug 18 2024 CROSSREFS Sequence in context: A190852 A005839 A254792 * A092289 A079358 A184014 Adjacent sequences: A062099 A062100 A062101 * A062103 A062104 A062105 KEYWORD base,easy,nonn AUTHOR Erich Friedman, Jun 28 2001 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 September 16 18:24 EDT 2024. Contains 375977 sequences. (Running on oeis4.)