A048796 Palindromic primes formed from decimal expansion of Pi written backwards then forwards.

3, 131, 32397985356295141314159265358979323

Offset

1,1

Comments

The next term 729096599629...1413141...926995690927 has 2971 digits. - Metin Sariyar, Jul 07 2020

Links

Table of n, a(n) for n=1..3.

Chris K. Caldwell and G. L. Honaker, Jr., Prime Curios! 729...927 (2971-digits)

Mathematica

l={}; Do[a=Floor[Pi*10^n]; r=IntegerReverse[a]; r2=Floor[r/10]; c=FromDigits[Flatten[IntegerDigits/@Join[r2, a]]];
If[PrimeQ[c], AppendTo[l, c]], {n, 0, 100}]; l (* Metin Sariyar, Jul 07 2020 *)

Crossrefs

Cf. A000796, A007523, A039954.

Sequence in context: A083999 A090540 A262643 * A213203 A199141 A152435

Adjacent sequences: A048793 A048794 A048795 * A048797 A048798 A048799

Keyword

base,nonn,bref

Author

G. L. Honaker, Jr.

Status

approved