A023530 Sum of exponents in prime-power factorization of p(n)*p(n-1) + 1.

1, 1, 4, 4, 3, 6, 3, 6, 3, 3, 6, 4, 4, 6, 3, 4, 5, 8, 5, 4, 10, 5, 3, 3, 3, 4, 6, 4, 10, 3, 7, 4, 4, 6, 5, 8, 3, 5, 4, 4, 6, 10, 5, 14, 3, 8, 5, 3, 5, 8, 3, 4, 12, 5, 3, 6, 4, 10, 5, 3, 6, 6, 7, 3, 10, 4, 7, 4, 5, 8, 3, 6, 4, 4, 5, 4, 5, 4, 5, 6

Offset

1,3

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Join[{1}, Total[FactorInteger[#][[All, 2]]]&/@(Times@@@Partition[Prime[ Range[ 90]], 2, 1]+1)] (* Harvey P. Dale, Apr 21 2020 *)

Crossrefs

Sequence in context: A377049 A258075 A286296 * A337365 A345294 A233581

Adjacent sequences: A023527 A023528 A023529 * A023531 A023532 A023533

Keyword

nonn

Author

Clark Kimberling

Status

approved