A244841 4^p - 3^p - 1, where p is prime.

6, 36, 780, 14196, 4017156, 65514540, 17050729020, 273715645476, 70274600998836, 288161745774346860, 4611068345031103956, 18889015647572689857420, 4835666805462139528038300, 77370924198368872644117636, 19807014039751725440882699796

Offset

1,1

Comments

For p>3, all terms are divisible by 13.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..250

Mathematica

Table[(4^Prime[n] - 3^Prime[n] - 1), {n, 1, 30}]
4^#-3^#-1&/@Prime[Range[20]] (* Harvey P. Dale, May 27 2026 *)

Prog

(Magma) [4^p-3^p-1: p in PrimesUpTo(60)];

Crossrefs

Cf. A242083, A242084.

Sequence in context: A077290 A222780 A206636 * A268161 A082027 A203106

Adjacent sequences: A244838 A244839 A244840 * A244842 A244843 A244844

Keyword

nonn,changed

Author

Vincenzo Librandi, Jul 07 2014

Status

approved