A158997 Palindromes of the form m*reversal(m)+1 where m >= reversal(m), sorted on m.

2, 5, 11, 404, 737, 161, 575, 101, 1001, 10001, 1008001, 1008001, 100001, 227218812722, 1000001, 10000001, 3536651551566353, 100000001, 1000000001, 26993605822850639962, 10000000001, 100000000001, 140452633741147336254041, 1000000000001

Offset

1,1

Links

Table of n, a(n) for n=1..24.

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

Mathematica

r[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Do[If[m>=r[m]&& r[m r[m]+1]==m r[m]+1, Print[m r[m]+1]], {m, 1000000000}]

Crossrefs

Cf. A177856, A158999.

Sequence in context: A064772 A107989 A069504 * A101828 A071293 A234572

Adjacent sequences: A158994 A158995 A158996 * A158998 A158999 A159000

Keyword

nonn,base,more

Author

Farideh Firoozbakht, Jul 09 2009

Extensions

a(20)-a(22) from Sean A. Irvine, Dec 13 2009

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

a(23)-a(24) from Giovanni Resta, Aug 30 2018

Status

approved