login
A192560
Primes of the form n + sum of proper non-divisors of n.
1
2, 5, 7, 29, 41, 47, 239, 617, 719, 1217, 1523, 2017, 2411, 2801, 3359, 4933, 6959, 7369, 10079, 10271, 10181, 11801, 12479, 20399, 25247, 34319, 37853, 38639, 38923, 40823, 41887, 45599, 47939, 51749, 52289, 52127, 56207, 61031, 63113, 65519, 72959, 79559
OFFSET
1,1
COMMENTS
Generated by n = 2, 3, 4, 8, 9, 10, 22, 35, 38, 49, 55, 64,...
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
FORMULA
p: A000027(n)+A024816(n).
PROG
(PARI) for(n=2, 1e3, if(isprime(t=n*(n+3)/2-sigma(n)), print1(t", "))) \\ Charles R Greathouse IV, Jul 10 2011
CROSSREFS
Cf. A024816 (antisigma).
Sequence in context: A137098 A082013 A171831 * A174288 A293062 A293063
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(13)-a(50) from Charles R Greathouse IV, Jul 10 2011
STATUS
approved