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A097644 Numbers n such that pi(n)=reversal(n). 0
51, 130, 370, 8201, 73270, 82080, 26113610, 4854248220, 37682961610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This sequence has only two odd terms, i.e. 51 and 8201 and 10 divides all other terms. Next term is greater than 10^8.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

26113610 is in the sequence because

pi(26113610)=1631162=reversal(26113610).

MATHEMATICA

Do[If[PrimePi[m]==FromDigits[Reverse[IntegerDigits[m]]], Print[m]], {m, 100000000}]

CROSSREFS

Cf. A037171, A069215.

Sequence in context: A063314 A129298 A065010 * A044302 A044683 A044383

Adjacent sequences:  A097641 A097642 A097643 * A097645 A097646 A097647

KEYWORD

base,nonn

AUTHOR

Farideh Firoozbakht, Aug 25 2004

EXTENSIONS

Two more terms from Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified November 28 16:41 EST 2014. Contains 250364 sequences.