A053787 Nextprime(n^5) - n^5.
1, 5, 8, 7, 12, 13, 4, 3, 2, 3, 2, 7, 6, 17, 2, 7, 20, 11, 22, 3, 8, 7, 8, 13, 4, 3, 2, 9, 8, 7, 12, 35, 8, 3, 18, 5, 22, 33, 2, 7, 26, 5, 30, 35, 4, 13, 20, 13, 18, 17, 2, 15, 20, 13, 12, 5, 2, 9, 74, 11, 52, 47, 8, 3, 8, 53, 22, 3, 20, 27, 26, 5, 4, 53, 28, 7, 6, 19, 22, 17, 8, 31, 6, 17
Offset: 1
Examples
a(3)=8 because n^5=243 and next prime is 251; 251-243=8.
Programs
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PARI
a(n) = nextprime(n^5) - n^5; \\ Michel Marcus, Jun 06 2014
Formula
a(n) = A007920(n^5). - Michel Marcus, Jun 06 2014