OFFSET
1,1
COMMENTS
The Heinz number of a positive integer sequence (y_1,...,y_k) is prime(y_1)*...*prime(y_k).
FORMULA
EXAMPLE
The sequence of terms together with their prime indices begins:
2: {1}
4: {1,1}
20: {1,1,3}
884: {1,1,6,7}
528844: {1,1,10,15,25}
3460086044: {1,1,15,31,65,90}
340672148731996: {1,1,21,63,140,301,350}
477782556719729075524: {1,1,28,127,266,966,1050,1701}
11694209380474301218263758996: {1,1,36,255,462,2646,3025,6951,7770}
MATHEMATICA
Times@@@Table[Prime[StirlingS2[n, k]], {n, 1, 10}, {k, 1, n}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Gus Wiseman, May 07 2019
STATUS
approved