This number is a prime.

+ The smallest multidigit prime p such that π(p) and the pth prime are palindromic numbers. [Firoozbakht]

+ The smallest prime formed from the concatenation in order of first positive multiples of 3, i.e., 1*3 = 3, 2*3 = 6, 3*3 = 9 and followed by the smallest power of 3, i.e., 3^0 = 1. [Loungrides]

+ The smallest prime formed by reverse concatenation of the squares of three consecutive triangular numbers: {6^2, 3^2, 1^2}. [Jha]

(There is one curio for this number that has not yet been approved by an editor.)

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell