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A067826
Primes p such that sigma(2*p+1) > 3*(p+1).
0
31, 37, 67, 73, 97, 127, 157, 199, 229, 241, 277, 283, 307, 313, 331, 337, 367, 379, 397, 409, 457, 487, 499, 547, 577, 607, 619, 643, 661, 727, 757, 769, 787, 823, 829, 877, 907, 937, 967, 997, 1039, 1087, 1117, 1123, 1237, 1249, 1291, 1297, 1327, 1447
OFFSET
1,1
COMMENTS
Equivalently sequence gives primes in A053224(k)/2 when A053224(k) is even.
PROG
(PARI) isok(p) = isprime(p) && (sigma(2*p+1) > 3*(p+1)); \\ Michel Marcus, Nov 23 2013
CROSSREFS
Cf. A053224.
Sequence in context: A156974 A215431 A082957 * A107013 A107012 A276305
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Feb 08 2002
STATUS
approved