A066751 Triangular numbers whose reverse is prime.

3, 91, 136, 325, 703, 1081, 1378, 1711, 3655, 11026, 11476, 13861, 18145, 18721, 36046, 70876, 75466, 76636, 79003, 92665, 99235, 107416, 108811, 110215, 118828, 123256, 130816, 137026, 140185, 158203, 166753, 173755, 186355, 303031, 310078

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Prog

(PARI) Rev(x)= { local(d, r=0); while (x>0, d=x%10; x\=10; r=r*10 + d); return(r) } { n=0; for (m=1, 10^10, t=m*(m + 1)/2; if (t%10 && isprime(Rev(t)), write("b066751.txt", n++, " ", t); if (n==1000, return)) ) } \\ Harry J. Smith, Mar 21 2010

Crossrefs

Sequence in context: A203477 A339580 A115704 * A115886 A041439 A366219

Adjacent sequences: A066748 A066749 A066750 * A066752 A066753 A066754

Keyword

easy,nonn,base

Author

Jason Earls, Jan 16 2002

Status

approved