A114926 Numbers n such that pi(n)=reversal(n)-n.

1, 23, 526, 536, 1802, 4735, 17191, 38524, 235652, 36235483, 1086331411, 5316125655, 7202194357, 49294058315, 327040088933

Offset

1,2

Comments

a(16) > 10^13. - Giovanni Resta, Aug 08 2019

Links

Table of n, a(n) for n=1..15.

Example

36235483 is in the sequence because pi(36235483)=2217780= 38453263-36235483=reversal(36235483)-36235483.

Mathematica

Do[If[PrimePi[n]==FromDigits[Reverse[IntegerDigits[n]]] -n, Print[n]], {n, 30000000}]

Crossrefs

Cf. A072393, A100415.

Sequence in context: A170742 A218725 A136285 * A118338 A171328 A097778

Adjacent sequences: A114923 A114924 A114925 * A114927 A114928 A114929

Keyword

nonn,base,more

Author

Farideh Firoozbakht, Feb 03 2006

Extensions

a(11)-a(15) from Giovanni Resta, Aug 08 2019

Status

approved