A082992 Primes whose 10's complement is a triangular number.

7, 79, 97, 139, 439, 769, 829, 997, 1999, 3559, 6679, 6997, 7789, 9439, 9649, 9769, 9829, 20599, 25309, 32839, 34297, 36097, 42709, 44389, 49279, 49597, 56929, 64489, 65809, 72739, 76129, 79699, 82609, 84247, 86959, 89269, 89989, 90547, 93097

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..250

Mathematica

tctnQ[n_]:=Module[{c=1+FromDigits[9-IntegerDigits[n]]}, IntegerQ[ (Sqrt[8c+1]-1)/2]]; Select[Prime[Range[10000]], tctnQ] (* Harvey P. Dale, Sep 21 2012 *)

Crossrefs

Sequence in context: A156714 A350964 A106110 * A261181 A106107 A020471

Adjacent sequences: A082989 A082990 A082991 * A082993 A082994 A082995

Keyword

nonn,base

Author

Jason Earls, May 31 2003

Status

approved