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

1,1

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

Table of n, a(n) for n=1..28.

Giovanni Resta, Poulet n and Proth n

Crossrefs

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

Sequence in context: A324316 A182207 A138129 * A001235 A343708 A018850

Adjacent sequences: A242877 A242878 A242879 * A242881 A242882 A242883

Keyword

nonn

Author

Lear Young, May 25 2014

Extensions

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

Status

approved