

A210734


Primes p such that p + 1 or p  1 is a concatenation of successive even numbers starting from 2.


2




OFFSET

1,1


COMMENTS

a(9) has 625 digits, a(10) has 1476 digits, a(11) has 5048 digits, a(12) has 39024 digits.


LINKS

Arkadiusz Wesolowski, Table of n, a(n) for n = 1..10
G. L. Honaker, Jr. and Chris Caldwell, 24681...50451 (625digits)
Henri & Renaud Lifchitz, PRP Records


MATHEMATICA

lst = {}; c = 0; Do[c = c*10^IntegerLength[n] + n; a = c  1; If[PrimeQ[a], AppendTo[lst, a]]; b = c + 1; If[PrimeQ[b], AppendTo[lst, b]], {n, 2, 48, 2}]; lst


CROSSREFS

Cf. A019520.
Sequence in context: A088056 A009593 A009818 * A166315 A113577 A224700
Adjacent sequences: A210731 A210732 A210733 * A210735 A210736 A210737


KEYWORD

base,nonn


AUTHOR

Arkadiusz Wesolowski, May 10 2012


STATUS

approved



