Geodesic
Prime and composite terms in Sloane's sequence A056542
Journal of integer sequences, Tome 8 (2005) no. 3.

Voir la notice de l'article provenant de la source Electronic Library of Mathematics

Summary: We give the complete factorization of the first fifty terms of the sequence $a_{n} := na_{n-1}+1$ with $a_{1}$ := 0. We searched the terms $a_{n}$ for primes up to $n=1019$ with the result that only the indexes 4, 8, 18, 20 and 70 provide primes. A final section deals with some conjectures on prime terms in this sequence.
Keywords: factorization, integer sequence, prime number (Concerned with sequences and 
@article{JIS_2005__8_3_a1,
     author = {M\"uller, Tom},
     title = {Prime and composite terms in {Sloane's} sequence {A056542}},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {8},
     number = {3},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2005__8_3_a1/}
}
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Müller, Tom. Prime and composite terms in Sloane's sequence A056542. Journal of integer sequences, Tome 8 (2005) no. 3. http://geodesic.mathdoc.fr/item/JIS_2005__8_3_a1/