A242880 Numbers that are both Poulet and Proth.

1729, 4033, 8321, 12801, 65281, 130561, 348161, 3225601, 8355841, 8384513, 16773121, 40280065, 104988673, 2147418113, 4294901761, 4294967297, 53282340865, 68719214593, 137439477761, 1099510579201, 1911029760001, 2199021158401, 8796097216513, 281474959933441, 9007199388958721, 576460753377165313, 2305843011361177601, 18446744073709551617

Offset: 1

Author

Lear Young, May 25 2014

Keywords

• nonn

Comments

Intersection of A080075 and A001567.

a(1) = 1729 is known as the Hardy-Ramanujan number (see A001235). - Omar E. Pol, Jun 14 2014

Links

• Giovanni Resta, Poulet n and Proth n.

Crossrefs

Cf. A080075 (Proth numbers), A001567 (Poulet numbers).

Extensions

a(20)-a(28) from Max Alekseyev, May 28 2014