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A145105
a(n) = n if n is prime or a perfect number, otherwise a(n) = 0.
0
0, 2, 3, 0, 5, 6, 7, 0, 0, 0, 11, 0, 13, 0, 0, 0, 17, 0, 19, 0, 0, 0, 23, 0, 0, 0, 0, 28, 29, 0, 31, 0, 0, 0, 0, 0, 37, 0, 0, 0, 41, 0, 43, 0, 0, 0, 47, 0, 0, 0, 0, 0, 53, 0, 0, 0, 0, 0, 59, 0, 61, 0, 0, 0, 0, 0, 67, 0, 0, 0, 71, 0, 73, 0, 0, 0, 0, 0, 79, 0, 0, 0, 83, 0, 0, 0, 0, 0, 89, 0, 0, 0
OFFSET
1,2
LINKS
Y. K. Huen, A matrix map for prime and non-prime numbers, International Journal Of Mathematics, Education, Science and Technolology Vol. 6: pages 913-920, 1994.
CROSSREFS
Sequence in context: A364575 A267186 A248092 * A140700 A055615 A366390
KEYWORD
nonn,less
AUTHOR
Huen Yeong Kong (cosmology(AT)pacific.net.sg), Oct 02 2008
EXTENSIONS
Edited and corrected by Joerg Arndt, Dec 27 2018
STATUS
approved