A158999 - OEIS

A158999

Palprimes of the form m*reversal(m)+1, sorted on m.

2, 5, 11, 101, 1008001, 1008001

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OFFSET

1,1

COMMENTS

There is no further term up to 5*10^17. 1008001 is the only known palprime which has two representations of the form m*reversal(m)+1 (m > reversal(m)).

LINKS

Table of n, a(n) for n=1..6.

Carlos Rivera,P*R(P)+1 = Palprime

MATHEMATICA

r[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Do[If[m>=r[m]&&PrimeQ[m r[m]+1] && r[m r[m]+1]==m r[m]+1, Print[m r[m]+1]], {m, 710000000}]

CROSSREFS

Cf. A158997, A177856.

Sequence in context: A134996 A134998 A078790 * A283300 A069506 A239900

Adjacent sequences: A158996 A158997 A158998 * A159000 A159001 A159002

KEYWORD

base,more,nonn

AUTHOR

Farideh Firoozbakht, Jul 09 2009

EXTENSIONS

Cross-reference fixed by Franklin T. Adams-Watters, May 14 2010

STATUS

approved