

A155108


Primes k such that the kth composite is even.


2



2, 3, 5, 7, 11, 13, 19, 29, 31, 37, 41, 43, 47, 59, 67, 71, 79, 83, 89, 101, 103, 107, 109, 113, 127, 137, 139, 149, 151, 157, 163, 179, 181, 197, 199, 211, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 293, 307, 311, 331, 337, 347, 349, 353, 359, 373, 389
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OFFSET

1,1


LINKS

Muniru A Asiru, Table of n, a(n) for n = 1..20000


EXAMPLE

2 is a term because composite(2) = 6 (even);
3 is a term because composite(3) = 8 (even);
5 is a term because composite(5) = 10 (even);
7 is a term because composite(7) = 14 (even);
11 is a term because composite(11) = 20 (even).


PROG

(GAP) A:=Filtered([2..500], n>not IsPrime(n));;
a:=Filtered(Filtered([1..Length(A)], IsPrime), i>IsEvenInt(A[i])); # Muniru A Asiru, Feb 10 2019


CROSSREFS

Cf. A000040, A002808.
Sequence in context: A227202 A237827 A114111 * A222565 A113188 A242738
Adjacent sequences: A155105 A155106 A155107 * A155109 A155110 A155111


KEYWORD

nonn


AUTHOR

JuriStepan Gerasimov, Jan 20 2009


EXTENSIONS

Corrected (105 replaced by 107, 239 and 263 inserted) by R. J. Mathar, May 10 2010


STATUS

approved



