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A264771 Primes of the form n^2 + phi(n). 0
2, 5, 11, 29, 131, 181, 233, 379, 991, 1109, 1249, 1721, 2633, 2861, 3539, 4273, 6971, 8009, 8353, 10301, 10711, 13313, 17291, 19973, 22349, 26053, 26731, 32941, 34369, 35129, 36671, 37441, 39799, 47269, 49033, 54521, 58321, 69431, 79241, 82609, 87257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..41.

EXAMPLE

The prime 29 is in sequence because 29 = 5^2 + phi(5).

MATHEMATICA

Select[Table[n^2 + EulerPhi[n], {n, 500}], PrimeQ]

PROG

(Magma) [a: n in [1..300] | IsPrime(a) where a is n^2 + EulerPhi(n)];

(PARI) for(n=1, 1e3, if(isprime(k=n^2 + eulerphi(n)), print1(k, ", "))) \\ Altug Alkan, Nov 24 2015

CROSSREFS

Cf. A000010, A000290, A258435, A264724.

Sequence in context: A160911 A092764 A237811 * A176637 A272675 A059075

Adjacent sequences:  A264768 A264769 A264770 * A264772 A264773 A264774

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 24 2015

STATUS

approved

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Last modified September 29 16:23 EDT 2022. Contains 357090 sequences. (Running on oeis4.)