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A131102
Prime numbers arising from A131101.
1
2, 5, 7, 11, 23, 47, 37, 59, 41, 43, 47, 83, 107, 73, 83, 89, 97, 167, 179, 227, 139, 137, 151, 263, 151, 167, 157, 197, 347, 193, 359, 223, 383, 229, 241, 467, 479, 257, 293, 503, 281, 307, 283, 307, 317, 563, 313, 313, 587, 331, 349, 349, 367, 367, 419, 719
OFFSET
1,1
COMMENTS
The Safe Primes (A005385) are part of this sequence because they are the result of adding A005384(n) (Sophie Germain primes) to its only prime factor (itself) + 1 = 2*A005384 + 1 .
FORMULA
A131101(n) + prime factors of A131101(n) + 1 = a(n) ; a(n) is a prime number.
EXAMPLE
a(8)=59 because 59 = A131101(8)+ prime factors of A131101(8) +1 = 29+ (29) +1.
a(9)=41 because A131101(9)+ prime factors of A131101(8) + 1 = 30 +(2+3+5)+1.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Tomas Xordan, Jun 14 2007
STATUS
approved