A111484 Triangular numbers all of whose digits are nonprimes.

0, 1, 6, 10, 66, 91, 190, 406, 496, 666, 861, 946, 990, 1081, 1891, 4186, 6441, 8001, 8646, 8911, 9180, 10011, 10440, 14196, 16110, 19110, 19900, 40186, 41041, 41616, 49141, 64980, 66066, 69006, 80601, 81406, 81810, 84666, 88410, 90100, 91806

Offset: 1

Author

Jonathan Vos Post, Nov 15 2005

Keywords

• base
• easy
• nonn

Crossrefs

Cf. A000217, A002808, A084984.

Programs

Perl

my $n = 0, $t = 0, $i = 0;
for (; $n < 6293912; $n++, $t += $n) {
 if ($t =~ m/^[014689]+$/) {
  $i++;
  print("$i $t\n");
 }
} # Charles R Greathouse IV, Dec 17 2010