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A023522
Sum of exponents in prime-power factorization of p(n)*p(n-1) - 1.
1
1, 2, 2, 3, 2, 4, 3, 3, 4, 2, 3, 3, 2, 4, 4, 3, 3, 4, 4, 2, 4, 4, 3, 5, 4, 3, 5, 5, 3, 5, 3, 4, 2, 4, 3, 5, 4, 4, 6, 4, 3, 3, 3, 4, 3, 4, 5, 4, 4, 3, 3, 3, 4, 4, 5, 4, 4, 3, 5, 2, 3, 5, 3, 4, 6, 3, 4, 3, 3, 4, 3, 5, 8, 3, 4, 6, 8, 3, 6
OFFSET
2,2
LINKS
FORMULA
a(n) = A001222(A023515(n)). - Michel Marcus, Sep 30 2013
MATHEMATICA
PrimeOmega[Times@@#-1]&/@Partition[Prime[Range[80]], 2, 1] (* Harvey P. Dale, Nov 22 2014 *)
PROG
(PARI) a(n) = bigomega(prime(n)*prime(n-1) - 1); \\ Michel Marcus, Sep 30 2013
CROSSREFS
Sequence in context: A297113 A086375 A107324 * A366311 A355271 A205000
KEYWORD
nonn
EXTENSIONS
Offset set to 2 and a(1) removed by Michel Marcus, Sep 30 2013
STATUS
approved