OFFSET
1,1
COMMENTS
Numbers whose maximum prime index and number of prime indices counted with multiplicity differ by 1.
The Heinz number of an integer partition (y_1,...,y_k) is prime(y_1)*...*prime(y_k).
LINKS
EXAMPLE
The sequence of terms together with their prime indices begins:
3: {2}
4: {1,1}
10: {1,3}
12: {1,1,2}
15: {2,3}
18: {1,2,2}
25: {3,3}
27: {2,2,2}
28: {1,1,4}
40: {1,1,1,3}
42: {1,2,4}
60: {1,1,2,3}
63: {2,2,4}
70: {1,3,4}
88: {1,1,1,5}
90: {1,2,2,3}
98: {1,4,4}
100: {1,1,3,3}
105: {2,3,4}
112: {1,1,1,1,4}
MATHEMATICA
Select[Range[1000], Abs[PrimePi[FactorInteger[#][[-1, 1]]]-PrimeOmega[#]]==1&]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Apr 13 2019
STATUS
approved