OFFSET
1,1
LINKS
R. Zumkeller, Table of n, a(n) for n = 1..1000
EXAMPLE
k=1, prime(1)=2: {2} = {a(1)},
k=2, prime(2)=3: {3,3*5} = {a(2),a(7)},
k=3, prime(3)=5: {5,3*5,5*7} = {a(3),a(7),a(13)},
k=4, prime(4)=7: {7,5*7,7*7} = {a(4),a(7),a(18)},
k=5, prime(5)=11: {11,11*11,11*13,11*17} = {a(5),a(34),a(39),a(49)},
k=6, prime(6)=13: {13,11*13,13*13,13*17,13*19} = {a(6),a(39),a(45),a(55),a(62)};
k=7, prime(7)=17: {17,11*17,13*17,17*17,17*19,17*23} = {a(8),a(49),a(55),a(71),a(77),a(90)}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Aug 11 2006
STATUS
approved