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A173153 Values of n such that either {0,1}*n^2+n+41 is prime. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
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
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
50, 57 inserted, 90 and 98 removed by R. J. Mathar, Mar 09 2010
STATUS
approved

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Last modified March 18 22:34 EDT 2024. Contains 370951 sequences. (Running on oeis4.)