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

1,3

Links

Table of n, a(n) for n=1..41.

Prog

(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

Crossrefs

Cf. A000217, A002808, A084984.

Sequence in context: A136847 A250106 A230827 * A119041 A105157 A166386

Adjacent sequences: A111481 A111482 A111483 * A111485 A111486 A111487

Keyword

base,easy,nonn

Author

Jonathan Vos Post, Nov 15 2005

Status

approved