A255578 Carmichael numbers of the form (12*k+1)*(24*k+1)*(36*k+1)*(72*k+1), where 12*k+1, 24*k+1, 36*k+1 and 72*k+1 are all primes.
461574735553, 84154807001953, 973694665856161, 3060522900274753, 11861640972220321, 386096840467598593, 2322064552169233153, 7545246852649391713, 9688364125836900193, 10972742858243841313, 11660828668219467073, 16553878978808515681, 17905475062325518273
Offset: 1
Keywords
Links
- Amiram Eldar, Table of n, a(n) for n = 1..10000
- Umberto Cerruti, Pseudoprimi di Fermat e numeri di Carmichael (in Italian), p. 14.
Programs
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Magma
[(12*n+1)*(24*n+1)*(36*n+1)*(72*n+1): n in [1..4000] | IsPrime(12*n+1) and IsPrime(24*n+1) and IsPrime(36*n+1) and IsPrime(72*n+1)];