A086655 (binomial(2*p,p)-2)/(2*p) where p runs through the primes.

1, 3, 25, 245, 32065, 400023, 68635477, 930138521, 178987624513, 518401146543811, 7506908923471953, 23596358977508462295, 5180299766448679532059, 77180849825857621779893, 17294692982395428197325697, 59174764703889164618206676203, 206412709386903552066428869508701

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..263

Formula

a(n) = A022553(prime(n)).

Mathematica

Table[(Binomial[2*p, p] - 2)/(2*p), {p, Prime[Range[18]]}] (* Amiram Eldar, Apr 21 2025 *)

Crossrefs

Cf. A000984, A022553.

Sequence in context: A099913 A245925 A260209 * A064326 A006091 A357232

Adjacent sequences: A086652 A086653 A086654 * A086656 A086657 A086658

Keyword

nonn

Author

Benoit Cloitre, Sep 11 2003

Extensions

Typo in definition corrected by Vladimir Shevelev, Sep 05 2010

Status

approved