

A138970


Positions of the primes congruent to 1 mod 4 when all primes except 2 are listed in order.


2



2, 5, 6, 9, 11, 12, 15, 17, 20, 23, 24, 25, 28, 29, 32, 34, 36, 39, 41, 43, 44, 49, 50, 52, 54, 56, 58, 59, 61, 64, 65, 67, 69, 70, 73, 76, 77, 78, 79, 81, 83, 86, 87, 88, 96, 97, 99, 101, 103, 105, 107, 109, 111, 112, 115, 118, 120, 121, 122, 125, 126, 129, 133, 134, 135
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OFFSET

1,1


COMMENTS

Complement of A138971 (positions of primes congruent to 3 mod 4).


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000


MATHEMATICA

Position[Table[If[Mod[p, 4]==1, 1, 0], {p, Prime[Range[2, 200]]}], 1]//Flatten (* Harvey P. Dale, Jun 22 2021 *)


CROSSREFS

Cf. A138971.
Sequence in context: A075724 A049408 A342733 * A168550 A244737 A285347
Adjacent sequences: A138967 A138968 A138969 * A138971 A138972 A138973


KEYWORD

nonn


AUTHOR

Clark Kimberling, Apr 05 2008


STATUS

approved



