A350173 Write the square of 1st prime, then the 2nd prime, then the square of 3rd prime, alternately squaring or not.

4, 3, 25, 7, 121, 13, 289, 19, 529, 29, 961, 37, 1681, 43, 2209, 53, 3481, 61, 4489, 71, 5329, 79, 6889, 89, 9409, 101, 10609, 107, 11881, 113, 16129, 131, 18769, 139, 22201, 151, 24649, 163, 27889, 173, 32041, 181, 36481, 193, 38809, 199, 44521, 223, 51529, 229, 54289, 239, 58081, 251, 66049, 263, 72361, 271, 76729, 281, 80089, 293

Offset

1,1

References

J.-P. Delahaye, Des suites fractales d’entiers, Pour la Science, No. 531 January 2022. Sequence f) p. 82.

Links

Table of n, a(n) for n=1..62.

Maple

[seq(ithprime(n)^(1+(n mod 2)), n=1..80)]; # N. J. A. Sloane, Dec 18 2021

Prog

(Python)
from sympy import prime
def A350173(n): return prime(n)**(n%2+1) # Chai Wah Wu, Dec 19 2021

Crossrefs

Cf. A000040, A001248.

Sequence in context: A224515 A286328 A189742 * A243237 A072044 A286795

Adjacent sequences: A350170 A350171 A350172 * A350174 A350175 A350176

Keyword

nonn

Author

Michel Marcus, Dec 18 2021

Status

approved