A039657 Number of digits in all (2n+1)-digit palindromic primes.

4, 45, 465, 4676, 46548, 462462, 4598113, 45549645, 459768842, 4542783435, 45319909593, 454084412972, 4520384784125

Offset

0,1

References

For 17-digit palindromic primes, work of Martin Eibl, Carlos Rivera and Warut Roonguthai on De Geest's website

Links

Table of n, a(n) for n=0..12.

Patrick De Geest, World!Of Palindromic Primes, Page 1

Formula

a(n) = (2n+1)*A040025(n). - Michel Marcus, Jul 24 2015

Example

There are 5172 9-digit palindromic primes, 5172*9 = 46548 digits.

Crossrefs

Cf. A040025.

Sequence in context: A055602 A346629 A073565 * A114473 A275125 A264123

Adjacent sequences: A039654 A039655 A039656 * A039658 A039659 A039660

Keyword

nonn,base,more

Author

Enoch Haga

Extensions

a(9)-a(11) from A040025 added by Michel Marcus, Jul 24 2015

a(12) from A040025 added by Max Alekseyev, May 26 2026

Status

approved