

A081735


Numbers n such that the nth Motzkin number == 1 (mod n).


2



1, 3, 4, 5, 7, 11, 13, 17, 19, 23, 25, 29, 30, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 121, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257
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OFFSET

1,2


COMMENTS

All odd primes and all squares of primes are in the sequence. First composite (and not square of prime) are : 30,464,902,21475....


LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..1000


PROG

(PARI) a001006(n) = polcoeff((1xsqrt((1x)^24*x^2+x^3*O(x^n)))/(2*x^2), n);
for(n=1, 1e3, if((a001006(n)1) % n == 0, print1(n, ", "))); \\ Altug Alkan, Jan 07 2016


CROSSREFS

Cf. A001006.
Sequence in context: A330110 A330123 A140826 * A227231 A107036 A001605
Adjacent sequences: A081732 A081733 A081734 * A081736 A081737 A081738


KEYWORD

nonn


AUTHOR

Benoit Cloitre, Apr 06 2003


EXTENSIONS

First term 1 prepended by Altug Alkan, Jan 07 2016


STATUS

approved



