A173153 Values of n such that either {0,1}*n^2+n+41 is prime.

1, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 22, 23, 24, 25, 27, 28, 29, 31, 33, 34, 35, 36, 37, 39, 43, 45, 46, 47, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 63, 64, 67, 69, 70, 71, 73, 74, 75, 77, 78, 79, 80, 83, 85, 88, 92, 93, 94, 95, 96, 97, 99, 100, 101, 103

Offset

1,2

Links

Table of n, a(n) for n=1..71.

Formula

a(n) ~ n log n. - Charles R Greathouse IV, May 25 2011

Example

1 is a term because 0*1^2+1+41=42=nonprime and 1*1^2+1+41=43=prime.
56 is a term because 0*56^2+56+41=97=prime and 1*56^2+56+41=3233=nonprime.

Crossrefs

Sequence in context: A078358 A175968 A152012 * A231711 A039131 A278637

Adjacent sequences: A173150 A173151 A173152 * A173154 A173155 A173156

Keyword

nonn,easy

Author

Juri-Stepan Gerasimov, Feb 11 2010

Extensions

50, 57 inserted, 90 and 98 removed by R. J. Mathar, Mar 09 2010

Status

approved