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 A045710 Primes with first digit 4. 21
 41, 43, 47, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 4201, 4211 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..5000 MATHEMATICA Select[Table[Prime[n], {n, 1000}], First[IntegerDigits[#]] == 4 &] Flatten[Table[Prime[Range[PrimePi[4 * 10^n] + 1, PrimePi[5 * 10^n]]], {n, 3}]] (* Alonso del Arte, Jul 19 2014 *) PROG (MAGMA) [p: p in PrimesUpTo(10^4) | Intseq(p)[#Intseq(p)] eq 4]; // Bruno Berselli, Jul 19 2014 CROSSREFS For primes with initial digit d (1 <= d <= 9) see A045707, A045708, A045709, A045710, A045711, A045712, A045713, A045714, A045715; A073517, A073516, A073515, A073514, A073513, A073512, A073511, A073510, A073509 Column k=4 of A262369. Sequence in context: A243429 A062669 A284290 * A090152 A139774 A007643 Adjacent sequences:  A045707 A045708 A045709 * A045711 A045712 A045713 KEYWORD nonn,base,easy AUTHOR EXTENSIONS More terms from Erich Friedman. STATUS approved

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Last modified February 24 00:19 EST 2020. Contains 332195 sequences. (Running on oeis4.)