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A096450 Primes p such that the number of primes q, 7 <= q < p, congruent to 1 or 2 mod 5, is equal to the number of such primes congruent to 3 or 4 mod 5. 0
7, 29, 37, 61, 89, 101, 107, 113, 131, 151, 181, 239, 251, 271, 397, 421, 443, 463, 479, 491, 503, 557, 569, 577, 601, 743, 757, 787, 857, 863, 881, 887, 1291, 1511, 1531, 1549, 1609, 1657, 1667, 1693, 1699, 1861, 1987, 1997, 2003, 2017, 2053, 2377, 2393 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

First term prime(4) = 7 is placed on 0th row.

If prime(n-1) = 1 or 2 mod 5 is on k-th row then we put prime(n) on (k-1)-st row.

If prime(n-1) = -1 or -2 mod 5 is on k-th row then we put prime(n) on (k+1)-st row.

This process produces the following array of prime numbers:

31, 97, ... row -1

7, 29, 37, 61, 89, 101, ... row 0 (this sequence)

11, 17, 23, 41, 47, 59, 67, 83, ... row 1 (A096454)

13, 19, 43, 53, 71, 79, ... row 2 (A096455)

73, ...

LINKS

Table of n, a(n) for n=1..49.

CROSSREFS

Cf. A096448-A096455.

Sequence in context: A262285 A041088 A107923 * A156124 A155476 A166970

Adjacent sequences:  A096447 A096448 A096449 * A096451 A096452 A096453

KEYWORD

nonn,easy

AUTHOR

Yasutoshi Kohmoto, Aug 12 2004

EXTENSIONS

More terms and better definition from Joshua Zucker, May 21 2006

STATUS

approved

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)