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

1,1

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.

Prog

(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)];

Crossrefs

Cf. A002997, A255218.

Sequence in context: A289111 A364785 A209833 * A239921 A250867 A104303

Adjacent sequences: A255575 A255576 A255577 * A255579 A255580 A255581

Keyword

nonn

Author

Vincenzo Librandi, Feb 26 2015

Status

approved