A095826 Numbers k such that k + largest digit of k is a triangular number.

0, 3, 5, 19, 24, 28, 33, 41, 50, 58, 60, 69, 71, 83, 96, 115, 128, 133, 165, 182, 205, 268, 291, 322, 369, 371, 397, 402, 431, 488, 519, 523, 587, 624, 658, 660, 694, 734, 773, 812, 853, 894, 937, 981, 1032, 1074, 1119, 1124, 1168, 1318, 1323, 1369, 1371, 1535

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

41 is a term because 41 + 4 = 45, a triangular number.

Mathematica

nldnQ[n_]:=IntegerQ[(Sqrt[8(n+Max[IntegerDigits[n]])+1]-1)/2]; Select[ Range[0, 2000], nldnQ] (* Harvey P. Dale, May 29 2012 *)

Crossrefs

Cf. A054055, A000217.

Sequence in context: A118484 A243898 A243900 * A058778 A211439 A088785

Adjacent sequences: A095823 A095824 A095825 * A095827 A095828 A095829

Keyword

base,easy,nonn

Author

Jason Earls, Jul 10 2004

Status

approved