A381004 Primes ending in 777.

1777, 2777, 11777, 19777, 22777, 26777, 41777, 43777, 44777, 47777, 50777, 53777, 65777, 67777, 68777, 71777, 76777, 79777, 80777, 83777, 94777, 97777, 107777, 110777, 113777, 115777, 122777, 124777, 125777, 131777, 134777, 136777, 137777, 145777, 146777

Offset

1,1

Links

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

Formula

a(n) = 1000*A102343(n)+777. - R. J. Mathar, Feb 13 2025

Maple

select(isprime, [i*1000+777$i=1..150])[];  # Alois P. Heinz, Feb 12 2025

Mathematica

Select[Table[1000 n + 777, {n, 200}], PrimeQ]

Prog

(PARI) select(x->((x % 1000)==777), primes(20000)) \\ Michel Marcus, Feb 12 2025
(PARI) select(isprime, vector(200, n, 1000*n+777)) \\ Michel Marcus, Feb 12 2025
(Python)
from itertools import count, islice
from sympy import isprime
def A381004_gen(): # generator of terms
    return filter(isprime, count(777, 1000))
A381004_list = list(islice(A381004_gen(), 20)) # Chai Wah Wu, Feb 12 2025

Crossrefs

Cf. A193552.

Sequence in context: A233953 A282404 A167282 * A237906 A187524 A253057

Adjacent sequences: A381001 A381002 A381003 * A381005 A381006 A381007

Keyword

nonn,easy

Author

Harvey P. Dale, Feb 11 2025

Status

approved