OFFSET
1,1
COMMENTS
Numbers whose maximum prime index is one greater than their number of prime indices counted with multiplicity.
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}
10: {1,3}
15: {2,3}
25: {3,3}
28: {1,1,4}
42: {1,2,4}
63: {2,2,4}
70: {1,3,4}
88: {1,1,1,5}
98: {1,4,4}
105: {2,3,4}
132: {1,1,2,5}
147: {2,4,4}
175: {3,3,4}
198: {1,2,2,5}
208: {1,1,1,1,6}
220: {1,1,3,5}
245: {3,4,4}
297: {2,2,2,5}
308: {1,1,4,5}
MATHEMATICA
Select[Range[1000], PrimePi[FactorInteger[#][[-1, 1]]]-PrimeOmega[#]==1&]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, Apr 13 2019
STATUS
approved