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A363750 Primes p such that p-1 can be written as a product of smaller numbers that are also of the form prime-1. 2
2, 5, 13, 17, 37, 41, 61, 73, 89, 97, 101, 109, 113, 157, 181, 193, 233, 241, 257, 277, 281, 313, 337, 349, 353, 397, 401, 409, 421, 433, 449, 457, 461, 521, 541, 577, 593, 601, 613, 617, 641, 661, 673, 701, 733, 757, 761, 769, 821, 829, 877, 881, 929, 937 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
2 is a term because 2 is prime and 2-1 = 1 equals the empty product.
5 is a term because 5 is prime, 5-1 = 2*2 = (3-1)*(3-1), and 3 is prime.
3329 is a term because 3329 is prime, 3329-1 = 4*16*52 = (5-1)*(17-1)*(53-1), and 5, 17, and 53 are prime. (This is the first term that requires more than two factors.)
CROSSREFS
Sequence in context: A124255 A293173 A079936 * A102854 A156009 A215275
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified May 24 23:50 EDT 2024. Contains 372782 sequences. (Running on oeis4.)