A244435 -id:A244435 - cp's OEIS frontend

A244436 Numbers n such that A244435(n) is not in the set {A244435(n-1), A244435(n+1)}.

4, 7, 13, 14, 21, 27, 28

Offset: 1

Farideh Firoozbakht, Jul 19 2014

			A244435(27)=6118 is not in the set {A244435(26), A244435(28)}={1667, 8249} also A244435(28)=8249 is not in the set {A244435(27), A244435(29)}={6118, 9098} so 27 and 28 are two terms of this sequence.

Cf. A244434, A244435.

A244433 a(n) is the smallest number m such that 2im+1 is composite for all i, 0

Original entry on oeis.org

4, 12, 19, 19, 59, 92, 159, 159, 159, 227, 227, 256, 256, 256, 514, 514, 706, 706, 706, 706, 706, 706, 706, 1466, 1466, 1466, 1466, 1466, 1466, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 5207, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 21209, 62809, 62809, 62809, 86914, 86914, 86914, 152351

Offset: 1

Farideh Firoozbakht, Jul 18 2014

nonn

a(3)=a(4)=19, a(7)=a(8)=a(9)=159, ..., a(74)=a(75)=...=a(82)=424783, ... . A244434 gives numbers n such that a(n) does not belong to the set {a(n-1),a(n+1)}.

			a(3)=19 because all the three numbers 2*1*19+1=39, 2*2*19+1=77 & 2*3*19+1=115 are composite and 19 is the smallest such number.

Cf. A071576, A244434, A244435.

cp's OEIS Frontend

A244436 Numbers n such that A244435(n) is not in the set {A244435(n-1), A244435(n+1)}.

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