A295001 - cp's OEIS frontend

A295001 a(n) = nextprime(1/(2/sigma[-1](P(n)) - 1)) where P(n) = Product_{0 <= k < n} a(k), sigma[-1](x) = sigma(x)/x, a(0) = 4.

n	a(n)
0	4
1	11
2	23
3	257
4	13007
5	44512049
6	46880563785749
7	125637016478802067649031191
8	652182699863469019760217209096329987925268834143233
9	1800254420479597976179975458181139131985404009703136640765845238082635790500153934999846722641241849

[4, 11, 23, 257, 13007, 44512049, 46880563785749, 125637016478802067649031191, 652182699863469019760217209096329987925268834143233, 1800254420479597976179975458181139131985404009703136640765845238082635790500153934999846722641241849]

cp's OEIS Frontend

A295001 a(n) = nextprime(1/(2/sigma[-1](P(n)) - 1)) where P(n) = Product_{0 <= k < n} a(k), sigma[-1](x) = sigma(x)/x, a(0) = 4.

Table of values

List of values